Isaac O. Karikari, MD

Synonyms and inclusions · Multiple pterygium syndromes · Politeal pterygium syndromes Key references the full list of references can be found in the online version at Connective Tissue and its Heritable Disorders: Molecular hiv infection rates in pakistan generic 200 mg monuvir visa, Genetic and Medical Aspects antivirus for mac monuvir 200mg with mastercard. In adults hiv virus infection youtube order monuvir 200 mg free shipping, other differential diagnoses include lichen myxoedematosus and myxoedema with hoarseness hiv infection rates global purchase discount monuvir line. Twenty patients including 7 probands with autosomal dominant cutis laxa confirm clinical and molecular homogeneity Orphanet J Rare Dis 2013;8:36 hiv transmission method statistics discount 200 mg monuvir with mastercard. Comprehensive clinical and molecular analysis of 12 families with type 1 recessive cutis laxa. The stiff skin syndrome: case series, differential diagnosis of the stiff skin phenotype, and review of the literature. Neonatal progeroid (Wiedemann­Rautenstrauch) syndrome: a report of five new cases and review. Proposal for updating the pseudoxanthoma elasticum classification system and a review of the clinical findings. Mutation analysis of five new patients affected by prolidase deficiency; the lack of enzyme activity causes necrosislike cell death in cultured fibroblasts. Brittle bones, fragile molecular disorders of collagen gene structure and expression. On the basis of clinical and biological criteria, they are divided into vascular tumours and vascular malformations [1]. The identification of diseasecausing genes associated with precise clinical delineation of the phenotypes has become the foundation for better management of these diseases. For several of the familial forms, a paradominant inheritance has been established, with a combination of a germinal mutation and a local somatic second hit, whereas somatic/mosaic genetic defects cause the more common sporadic vascular malformations. Links between phenotypes and genotypes have been unravelled for several vascular malformations. It is present at birth in approximately three of 1000 newborns [3] and has equal sex distribution. This may explain the cooccurrence of vascular and pigmentary changes in phakomatosis pigmentovascularis. They are usually located on the head and neck, but can also be seen on the trunk or limbs. The lesion darkens and often thickens with age, and the underlying tissues (skin, fat, muscle and bone) can be hypertrophic. For example, on the upper face, the larger the lesion, the higher the risk for Sturge­Weber syndrome. About 75% of children with intracranial vascular anomaly develop seizures, most often before the age of 2 years, with a risk of contralateral neurological deficit and learning difficulties. The major ocular complication is glaucoma, occurring in more than 50% of patients. Epidemiology the incidence is estimated to be around one in 50 000, but the disorder is likely underdiagnosed [10]. There is no sex difference, the penetrance is high (>95%) and there is an important intrafamilial clinical variability. Somatic secondhit could explain the intrafamilial clinical variability and the multifocality of the lesions [10]. It is still questioned if prophylactic anticonvulsant treatment is recommended or not. Regular ophthalmological followup is needed throughout life, with reduced intervals during infancy. Some patients have areas of multiple punctate telangiectasias surrounded by white halos, especially on extremities. Note the red blush on the thorax and arm (c), which is warm on palpation, and dilated veins (d) secondary to arteriovenous fistulae and confirmed by arteriography (e). Associated symptoms are cardiac failure, hydrocephaly, epilepsy, developmental delay, para or tetraplegia and neurogenic bladder. The major problem associated with Parkes Weber syndrome is leg length discrepancy causing scoliosis. Pathophysiology Histologically, angioma serpiginosum appears as capillary ectasias in the superficial papillary dermis. The disorder seems to be genetically heterogeneous with Xlinked dominant and autosomal dominant inheritance. Such findings should be evaluated by Doppler ultrasound for the presence of fastflow lesions. Leg length discrepancy in patients with Parkes Weber syndrome is followed radiographically. Genetic consultation is needed to assess family history, and genetic testing can confirm the clinical diagnosis. They are histologically characterized by dilated capillarylike channels and/or large caverns. The risks and benefits to treat or not are based on symptoms, patient age, lesion size and location, angioarchitecture and expected evolution. The treatment of patients with Parkes Weber syndrome is as conservative as possible. Epiphysiodesis may be necessary; however this procedure should be avoided whenever possible as it may aggravate the fastflow lesion [17]. Sporadic and familial forms exist; usually one cerebral vascular lesion is observed in sporadic cases and multifocal lesions in familial cases. The familial forms comprise around 10­20% of Caucasian patients and up to 50% of Hispanic American patients of Mexican descent. There is no sex difference and the intrafamilial clinical variability is important. It has been shown that a somatic secondhit on the normal allele explains the multifocality of the lesions [23]. Using laser capture microdissection, the mutations were shown to occur in a subset of endothelial cells, but not in nonendothelial cells, and this was consistent with the immunohistochemistry studies [24]. Clinical features Cerebral cavernous malformations are localized in the central nervous system. About 60% of mutation carriers are symptomatic; associated symptoms are mainly seizures and cerebral Epidemiology Females are more often affected than males with a sex ratio of 9: 1 [18]. Importantly, new lesions appear with age and the size of the lesions tends to increase. Symptoms do not seem to correlate with the number of lesions, but with their location. The most severe outcome is associated with those in brainstem and basal ganglia [26]. Management Current clinical guidelines for symptomatic patients recommend medical treatment for seizures and surgical removal in case of haemorrhage, focal neurological deficit or intractable epilepsy. Investigations the vascular malformations are investigated as their sporadic, isolated counterparts. There is often persistence of the embryonic vein of the lateral thigh (vein of Servelle) and anomalies of the deep venous system (stenosis, hypoplasia, aplasia). There is a high risk for thromboembolism and subsequent pulmonary arterial hypertension [31]. It was described in patients earlier diagnosed with Proteus syndrome, although several specific criteria were lacking and the natural history was different [33,34]. Proteus syndrome is characterized by an asymmetrical, progressive, disproportionate, severely deforming, overgrowth of body parts with bony hypertrophy, dysregulated adipose tissue, epidermal naevi, vascular malformations and increased tumour risk [36]. Typically, some overgrowth can be observed at birth, but it is greatly accelerated postnatally. A very distinctive feature and a clue for diagnosis is the cerebriform connective tissue thickening mainly located in the soles and palms. Vascular malformations have been described: capillary, venous or lymphatic malformations. Other anomalies, including intellectual disability, cerebral malformations and ocular and renal anomalies have been reported [36,37]. Proteus syndrome is overdiagnosed, and it seems that at least half of the patients have another diagnosis [37]. The disorder is characterized by macrocephaly (megalencephaly) and capillary malformation, plus a variable combination of other features: overgrowth, brain and body asymmetry, syndactyly, polydactyly, developmental delay and joint hyperlaxity [40,41]. It is also used long term as a prophylactic treatment for those with documented pulmonary embolism [45,46]. Investigations Investigation includes neuroimaging studies, an electroencephalogram in case of seizures, and visual and hearing assessment. Arteriovenous malformations consist of distorted arteries, and veins with thickened muscle walls due to arteriovenous shunting and fibrosis [4]. An arteriovenous fistula consists of a direct communication between an artery and a vein. Evolution is variable and unpredictable, but many worsen with time and can become lifethreatening. Clinical manifestations depend on size, rheology and localization of the lesion, and the age of the patient. Symptoms in childhood and adulthood vary: hydrocephaly, headache, epilepsy, haemorrhage and focal neurological deficit in intracranial lesions; cyanosis, clubbing, polycythaemia and righttoleft shunt with cerebral abscess and embolic stroke in pulmonary lesions; cardiac failure, portal hypertension and biliary disease in hepatic lesions; and heaviness, pain, pulsatile mass, thrill, trophic changes (deformation, ulceration, destruction) and bleeding in cutaneous, subcutaneous and muscular lesions. Investigations Radiological investigations are mandatory to confirm the clinical diagnosis, to delineate the lesion and to evaluate the therapeutic options: Doppler ultrasound shows highvelocity arterial and pulsatile venous flow with low resistance. Arteriography is done as a pretreatment examination to identify the feeding arteries and to localize the nidus. Evaluation should be made by a multidisciplinary team, including a dermatologist, internist or paediatrician, surgeon and interventional radiologist. It varies from conservative followup to aggressive treatment consisting of embolization and/or surgical resection. Conservative treatment includes antihypertensive medications, pain killers, elastic stockings and wound management. The effects of invasive treatment can be devastating, especially if not performed properly. Treatment should be as complete as possible to avoid recruitment of new feeding arteries, and aggravation of the malformation. Genetic consultation is needed to assess family history and to perform genetic testing. The extracranial ones are in general intramuscular or subcutaneous, associated with ectopic fat, disrupted architecture and severe and progressive enlargement of affected muscles. Cowden syndrome is characterized by macrocephaly, multiple hamartomas with an increased risk for benign and malignant tumours (such as thyroid, breast and endometrial cancer), and mucocutaneous lesions (trichilemmomas, acral keratosis, papillomatous lesions) (see also Chapter 80). Investigations Measurement of head circumference can help diagnose a patient with an atypical vascular lesion. There is often family history of the disease, necessitating genetic consultation and testing. Epidemiology the prevalence is estimated at 1: 200 000 [70], but the disorder is probably underdiagnosed [71]. The papillomatous papules are treated when symptomatic with topical agents, curettage, cryosurgery, laser or surgery. Epidemiology Venous malformations have an incidence estimated around 1: 10 000 [81]. They are the most frequent vascular malformations referred to specialized centres [82,83]. The latter are at high risk of disseminated intravascular coagulopathy with severe bleeding during interventional or surgical procedures. Differentiation is based on clinical history, and medical and Doppler ultrasound examination. It has not been observed as an inherited mutation suggesting it may be lethal when germline [88]. Disease course and prognosis Venous malformations grow proportionately with the individual. Aesthetic and functional impairment worsen with time because of expansion or bleeding. Lowmolecularweight heparin (100 antiXa/kg/ day) is used to relieve pain associated with elevated ddimer levels and to prevent bleeding during a surgical procedure [84,85]. Sclerotherapy followed by surgical resection (whenever possible) is the treatment of choice. Sclerosing agents include detergents (sodium tetradecyl sulphate, polidocanol, sodium morrhuate), microfoam, bleomycin, absolute ethanol and radioopaque ethylcelluloseethanol [95,96]. With the understanding of the underlying aetiopathogenic mechanisms, targeted molecular therapies are becoming possible. There is no thrill or bruit, and the malformation is not warmer than non lesional areas. Their lesions are cutaneous and subcutaneous, and rarely involve deeper structures. They are commonly smaller in diameter (<5 cm2), more superficial and less compressible. They mainly involve the skin and oral mucosa, but can rarely affect muscles, gastrointestinal tract, lungs and brain [86,98­100]. The single reported secondhit was shown to result in loss of function, presumably abolishing the protective effect of the wild type allele [87]. There is great intra and interfamilial variability in the number, size and location of lesions, confirming that the germline mutation is not sufficient to explain the disease. They are dark bluish to purple in colour, often hyperkeratotic, and Glomuvenous malformation 73. They can cause gastrointestinal haemorrhage with chronic iron deficiency and severe anaemia, intussusception, volvulus and infarction [104]. There is great variability in the number, size and location of lesions between affected individuals [89]. Chronic anaemia due to gastrointestinal bleeding necessitates iron supplementation and even blood transfusions.

Salivary scintigraphy showing delayed uptake antiviral cream contain order monuvir 200 mg without prescription, reduced concentration and/or delayed excretion of tracer 6 licorice antiviral purchase monuvir without prescription. The presence of any four of the six items above hiv infection unaids discount monuvir 200mg without prescription, so long as either item 4 (histopathology) or 6 (serology) is positive b antiviral pills discount monuvir online amex. In primary disease anti bullying viral video order monuvir canada, there is no association with connective tissue disease, whilst in secondary disease such an association is found ­ any connective tissue disease may be found with coexistent Sjögren syndrome. Inflammation in the salivary, lacrymal and sweat glands may be primary, in which case the exocrine dysfunction occurs alone, or, as secondary Sjögren syndrome, in association with a connective tissue disease. The most common features of the condition are dryness and atrophy of the conjunctiva and cornea (keratoconjunctivitis sicca) and a dry mouth (xerostomia). The diagnostic criteria, including these features and objective demonstration of exocrine dysfunction, are shown in Box 55. Malignant lymphoma is associated with the primary form of the disease, with a 40fold increased risk, the majority being of Bcell origin. Lymphadenopathy, parotid enlargement, palpable purpura, low C4 serum levels and cryoglobulins have been associated with the development of nonHodgkin lymphoma/ lymphoproliferative disease [5]. Pathophysiology Pathology the key cells and molecules involved in the autoimmune process have been detected in the glands of patients with Sjögren syndrome. A prominent feature of Sjögren syndrome is Bcell hyperactivity with high levels of circulating immunoglobulin. There is infiltration of the main target organ tissues, the salivary and lacrimal glands, by lymphocytes and plasma cells and characteristic findings include periductal and perivascular lymphocytic infiltration [7]. The underlying mechanisms that drive the hyperactivity of B cells remain to be fully defined. However, there is evidence of early innate immune activation within target tissues; dendritic cells accumulate in tissues and produce type I interferons and cytokines that promote immunoglobulin production by B cells Epidemiology There are no significant studies of the incidence and prevalence of Sjögren syndrome, but secondary disease occurs in around 15% of most connective tissue diseases. Recurrent annular erythema, similar to that seen in adults, has been reported on the face, trunk and limbs [6]. Ro and La autoantigens are expressed within the apoptotic blebs and stimulate autoantibody production by B cells [8]. Consistent with this model, recent gene expression profile data from analyses of peripheral blood and salivary gland samples from patients with Sjögren syndrome showed upregulation of type I interferon inducible genes [8]. Thus recent studies have shown that antimuscarinic receptor antibodies may act as a partial muscarinic agonist, interfering with the secretory effect of the parasympathetic neurotransmitter. It is suggested that this leads to functional disturbance and reduced salivary secretion [9]. Skin involvement occurs in around 50% of patients, and may be more common but not recognized. However, inflammatory and often necrotizing vasculitis can occur, including a rheumatoid pattern, lesions indistinguishable from polyarteritis nodosa and nail fold infarcts, splinter haemorrhages and gangrene of the fingers [9]. Clinical features [1] the clinical picture is extremely variable, but most patients present with a dry mouth or dry eyes. These may be a minor manifestation of a serious systemic illness, or the presenting, and for many years the only, features. Some cases present with generalized or anogenital pruritus, or with diffuse alopecia. Infections, including pneumonia, oral candidosis and bacterial conjunctivitis, are frequent. The tongue is red, smooth and dry, and in severe cases there may be difficulty in swallowing dry food. Dental caries are often severe and progressive, and chronic candidiasis is common. Recurrent episodes of swelling of one or both parotid glands or, less often, the submaxillary and sublingual glands, may be due to either autoimmune inflammation or infection, which is common [11]. Atrophic changes in the mucous membranes of the upper respiratory tract lead to nasal crusting and dryness, recurrent episodes of infection, hoarseness and/ or aphonia. Digestive symptoms are attributable to atrophy of the gastric mucous membrane with achlorhydria. Similar changes in the vulva and vagina give rise to pruritus and vaginitis, and dryness of the anal and rectal mucous membranes leads to dyschezia and pruritus. A high proportion of patients (approximately 70%) with Sjögren syndrome suffer from disabling fatigue, which is associated with reduced healthrelated quality of life [13]. In patients without associated connective tissue disease, mild articular symptoms such as mild synovitis occur in 83%. Cervical or generalized lymphadenopathy and enlargement of the liver and spleen, which is sometimes considerable, may be found. The main renal abnormalities appear to be interstitial nephritis, renal tubular acidosis, impaired renalconcentrating ability and generalized aminoaciduria [14]. A high prevalence of fetal loss has been recorded, but there was no correlation with either anticardiolipin or antiRo antibodies [15]. Complications and comorbidities [18] the potential complications are many, and include cerebral vasculitis, renal disease and, most importantly, lymphoma, which may occur at any stage and should be suspected in a patient whose symptomatology changes and who becomes generally unwell. Differential diagnosis So variable is the clinical picture that the diagnosis is easily overlooked, except in the more obvious cases presenting with ocular or oral symptoms. As a consequence, the differential diagnosis is wide and depends on the presenting features. Infection, salivary Disease course and prognosis the disease is chronic, but variably progressive. Some patients have minor persistent sicca symptoms, but others will suffer more severe and variable disease. Outcome is influenced by any associated connective tissue disease, and most significantly by the occurrence of lymphoma, mainly of the nonHodgkin type. Biopsy of the labial salivary glands [5] or nasal mucosa [6] is useful, and the value of lip biopsy has been stressed, but a negative biopsy does not exclude the diagnosis [7]. Key references Treatment Symptomatic treatment for the dryness of the eyes is best accomplished by lubricating agents, such as 0. Artificial saliva can be prescribed, and steam inhalations or an air humidifier may help dryness of the respiratory tract [1]. Systemic corticosteroids are effective in reducing parotid swelling, but rarely increase parotid or lacrimal secretion. Chloroquine or hydroxychloroquine sulphate by mouth have been found useful by some authors [2] but not by others [3]. Ciclosporin improved subjective xerostomia and may reduce histopathological progression [4]. The annular erythema may be controlled by prednisolone 10­20 mg/day or by dapsone. There is no single therapy that helps hyperglobulinaemic purpura, although graduated compression hosiery may be valuable. Whilst no treatment has so far modified disease progression in Sjögren syndrome, there is hope for a number of Bcelldirected therapies, including rituximab, that are currently being trialled [5]. Dermatological manifestations of rheumatoid arthritis Rheumatoid neutrophilic dermatosis 1. Fibroblastic rheumatism: clinical, histological, immunohistological, ultrastructural and biochemical study of a case. Sjögren syndrome Definition and nomenclature, Introduction and general description, Epidemiology, Pathophysiology 1. Poststreptococcal reactive arthritis: a clinical and serological description, revealing its distinction from acute rheumatic fever. It appears as evanescent, asymptomatic, pinkish, superficial semicircles and rings, which disappear without scaling or pigmentation in a few days. Histologically, there is a perivascular infiltration of neutrophils in the papillary dermis, and biopsy may help in the early diagnosis of rheumatic fever when the rash precedes arthritis and carditis [2]. Erythema multiforme, petechiae and urticaria may sometimes be seen in rheumatic fever. The overall clinical picture must be distinguished from poststreptococcal reactive arthritis [4]. It has high mortality due to cardiac, pulmonary and renal complications and substantial morbidity from pain, digital ulceration, calcinosis, telangiectases and gastrointestinal tract and musculoskeletal involvement [1­3]. Classification Systemic sclerosis is classified as an autoimmune rheumatic disease and can be reliably defined using recently developed classification criteria [11]. It should be noted that the classification criteria are not diagnostic, although operationally they may be used as such. This is Synonyms and inclusions Systemic sclerosis is one of the scleroderma spectrum disorders and is sometimes referred to as scleroderma. Two major subsets of systemic sclerosis, the limited and diffuse forms of the disease are generally differentiated [4,5]. Subset classification is important and to date has been based upon the extent of skin involvement [4,5]. The typical features of the limited and diffuse subsets are summarized in Table 56. Intrinsic subsets have been identified including inflammatory and fibroproliferative subgroups [19,20]. Such subsets may be of value in selecting cases that might be responsive to immunosuppressive therapy [21] although this remains to be confirmed. Introduction and general description Part 4: Inflammatory Systemic sclerosis is rare but important because it has the highest casespecific mortality of any autoimmune rheumatic disease and because it has a major nonlethal burden. Typically, a patient will present with Raynaud phenomenon and symptoms of gastrooesophageal reflux. This is followed by a phase of nonpitting digital oedema, after which the skin thickens, and sclerodactyly develops. These may be the main features, but severe internal organ manifestations such as cardiac, lung or renal complications are a major concern and may already be present at the time of presentation to a specialist. A review of 32 publications from 1969 to 2006 found a range of prevalence from 7 per million to 489 per million and incidences of 0. The key factors that have confounded assessment are disease rarity, clinical heterogeneity and the methodology used to assess frequency [23,24]. This especially reflects whether a populationbased or hospitalbased approach is used. African Americans appear to be affected at a younger age and with twice the frequency found in white individuals [22,28]. The highest rate described has been in Choctaw Native Americans, and is likely to have a genetic basis [29]. Geographical clustering may equally be influenced by environmental factors as has been suggested for sporadic clusters of increased prevalence seen, for instance, within areas of London, Rome and Ontario [22,30]. There may be two peaks of onset, between 30 and 40 years of age and between 50 and 60 years of age [26,32­34]. There appear to be distinct clinical presentations and outcomes in patients with lateronset disease, with those presenting over the age of 60 years of age suffering more frequently from the limited subtype, pulmonary hypertension and cardiovascular disease, and less often with digital ulcers [34,37]. Patients with onset in childhood are more likely to have limited or overlap forms of the disease and a better overall survival [38]. This predominance is most marked in premenopausal women, leading to the suggestion that it is hormone dependent [40]. Recent in vitro studies showing increased cell growth and fibronectin synthesis by scleroderma fibroblasts exposed to female sex hormones support this [41,42]. Males are thus more likely to have diffuse disease and interstitial lung disease and have a higher mortality [43]. The presence of another autoimmune disease was more common in patients with the limited subtype, and relatively mild disease [56]. In a study of 409 African American and 1808 white patients with scleroderma, whilst the sex distribution was identical at 82% female, African Americans presented at a younger mean age (47 versus 53 years). A higher proportion of white patients expressed the anticentromere antibody (34% versus 12%) and twothirds had the limited subset of disease. In contrast, the majority of African American patients manifested the diffuse subset, and 31% (versus 19% of white patients) had autoantibodies to topoisomerase [47]. African American women appear twice as likely as white women to have diffuse disease [51]. Conversely, scleroderma renal crisis appears to be less common in Chinese and Far Eastern populations [26,52]. Pulmonary arterial hypertension and interstitial lung disease can develop with time and result in increased mortality [59,61]. Initial clinical features and autoantibody profiles can be useful for predicting disease evolution [61,63]. The summary relative risk to develop all invasive cancers in scleroderma patients was 1. An increased risk of lung cancer, nonHodgkin lymphoma and haematopoietic cancer was confirmed, whilst an increased risk of bladder and liver cancer was found in one analysis. The relation with breast cancer, suggested in some previous epidemiological studies, was not confirmed in these metaanalyses. Other published associations have included oesophageal, oropharyngeal and nonmelanoma skin cancers [68]. Reasons for this increased risk have been poorly understood and often attributed to cytotoxic therapies or damage from scleroderma. Recognition that some patients have a close temporal relationship between cancer diagnosis and clinical onset of scleroderma has raised the possibility that scleroderma may be a paraneoplastic syndrome in a subset of patients. Distinct autoantibody profiles appear associated with specific clinical presentations and disease courses (Table 56. Anticentromere antibody was absent and antitopoisomerase infrequent in this group.

Pregnancy exacerbated eczema in 52% of women hiv stages of infection order monuvir overnight, whereas it ameliorated eczema in 24% [353] hiv infection rates bc best order for monuvir. It has been proposed that a possible mechanism by which sex steroids alter susceptibility to inflammatory skin diseases is by modification of sensitivity to antiinflammatory effects of glucocorticoids antiviral hsv buy cheap monuvir 200 mg. In a comparison of differences in susceptibility between men and women acute phase hiv infection symptoms purchase generic monuvir from india, Rohleder et al antiviral drugs ppt generic monuvir 200mg with amex. However, in men, glucocorticoid sensitivity was markedly increased 1 h after stress, whereas glucocorticoid sensitivity decreased significantly in women. Similarly, lipopolysaccharideinduced cytokine production decreased in response to stress in men but increased in women. It is not clear whether this is the result of the increased cortisol production suppressing cytokine production in men or of a change in responsiveness to lipopolysaccharide itself. Sweating Many patients are aware that sweating induces itching and aggravates their condition. This may reflect altered sensations associated with the neuropeptides released in the neurogenic control of sweat glands. Sweating in response to cholinergic stimulation was found to be reduced in volume by one group [340,341] but normal in volume, although of more prolonged duration, by another group [342]. They found that directly induced sweat production hardly differed from that in healthy controls, whereas axon reflexinduced sweating was of lower volume with a longer latency. The papules are intensely itchy, and may become exudative and crusted as a result of rubbing. The disease runs a chronic fluctuating course, varying with such factors as teething, respiratory infections, emotional upsets and changes in humidity. The itch can be aggravated by warmth, sweating, bathing, exercise, emotional upset and woollen clothes worn against the skin. Patients with an extensor distribution of eczema in later childhood are uncommon, and may take longer to remit. Acute generalized or localized vesiculation should always suggest the possibility of secondary bacterial or viral infection. Frequently, facial and hand involvement is more problematic in adulthood and many adults find the flexural inflammation less troublesome. Involvement of the vermilion of the lips and the adjacent skin is commonly an atopic manifestation. A distribution on the face, upper arms and back may correlate with areas of maximal thermal sweating or Malassezia sensitivity [6] (see reference [289] from previous section). Diagnostic criteria have been developed primarily for epidemiological and research use [1,2]. Several national guidelines suggest relatively simple estimates [2,3,4] as illustrated in Table 41. There are several quality of life indexes [2] that can be used, but a global assessment from the child, parent or carer of severity, itch and loss of sleep on a 0­10 scale could be a simple clinical aid to assessing severity. Differential diagnosis In the individual patient, one must consider a number of other conditions. Immunodeficiency states should also be considered in infants in whom the disease is unusually severe, when there are recurrent systemic or ear infections, and if there is failure to thrive, malabsorption or petechiae. The psychological disturbance caused by eczema is increasingly recognized and may be amenable to specific interventions. In children, the most troublesome symptoms are itching, distress at bath time and difficulty going to sleep. Severe eczema promotes family dysfunction, causing exhaustion, sleep deprivation and emotional distress [5] and may predispose to later problems with mental health [6]. Indeed, partial sleep disturbance is increasingly recognized to result in neurocognitive impairment. Teasing because of abnormal skin appearance can lead to concerns over contagion and social exclusion. This can lead on to negative effects on selfimage and selfesteem, particularly during adolescence [7]. Together these multiple elements can lead to behavioural difficulties in severely affected children [9,10]. Additionally, in severe disease that persists into adulthood, patients may develop patterns of established unstable reactions/behaviours to a variety of life situations (maladaptive schemas) [11]. Although rarely formally reviewed by psychological services, topical steroid phobia resulting in undertreatment is a greater problem in Western populations than overuse and has been reported in 81% of consecutive patients attending a French clinic, in whom 36% admitted nonadherence to treatment [13]. It used to be seen in severe cases before the advent of corticosteroid therapy, and can therefore be attributed to the disease. Whilst inappropriate use of topical corticosteroids can induce inhibition of the pituitary axis (Cushing syndrome) in both children and adults [16­18] there is no evidence that the appropriate use of topical corticosteroids affects growth adversely. The individual lesions start as the characteristic viral papulovesicles, but not necessarily with an herpetiform grouping. There may then be rapid evolution to a state in which extensive purulent exudate masks the initial papulovesicles, or superficial scattered erosions may be the only clue to the cause of a rapid deterioration of the eczema. However, the clinical impression is that widespread molluscum contagiosum is more common in the atopic child. As in hay fever, it may represent a true allergic reaction or it may be due to a nonallergic irritability such as occurs in the nose or skin. It is due to a degenerative change in the cornea, which is forced outwards by the intraocular pressure, giving rise to marked visual disturbances. Onset is in childhood, and after some years progress of the disease becomes arrested. Bacterial infections Secondary bacterial infection with staphylococci or streptococci is virtually an integral part of the clinical picture [19]. It contributes to many exacerbations of the disease, even without grossly visible purulent exudate. Indeed, any acute vesicular eruption in an atopic person should suggest the diagnosis of secondary bacterial or viral infection. Such episodes may present as a severe systemic illness with high fever and a widespread eruption. It occurs in up to 10% of the more severe adolescent and adult cases, but overall it is uncommon. It may start in early childhood or up to the age of 30 years, but the peak incidence is between 15 and 25 years. In the early stages, translucent globules and small opacities appear at the pole in front of the posterior capsule and also in the anterior subcapsular zone. Retinal detachment has been reported, particularly in Japanese patients, and appears to be identical to the retinal detachment seen following trauma [30]. The dry skin may be a consequence of abnormal ceramide and sphingosine synthesis and have an important role in the development of inflammation. Other patterns of eczema Infantile seborrhoeic dermatitis this condition is discussed in Chapter 40. Insufficient evidence exists regarding the risk of lymphoma with topical calcineurin inhibitors. Nonetheless, patients can develop sensitivity to a variety of contact allergens such as topical medicaments, including topical corticosteroids, fragrances and metals [11]. There is also a risk of protein contact sensitivity, such as that associated with latex in rubber gloves [12,13] (see Chapter 128). Part 4: Inflammatory Eczema Eczema + hay fever Eczema + asthma + hay fever Eczema + asthma 41. It can also occur as a result of food allergy, and in children with no known atopy or allergy. Its persistence, and perhaps its origin, is attributable to habits of lip licking, thumb sucking, dribbling or chapping. It is easily transformed into true perioral dermatitis by the application of potent corticosteroids. Contact sensitivity, for example to toothpaste ingredients, can occasionally be demonstrated. Several other patterns of eczema are seen in individuals with atopy, but they are also seen in nonatopic individuals. These include eczema with a predominantly follicular accentuation, and discoid eczema. Certain welldefined conditions appear more common in atopic individuals; pityriasis alba and juvenile plantar dermatosis are discussed in Chapter 39. Nodular prurigo can quite frequently complicate the atopic diathesis (Chapter 83). Part 4: Inflammatory (a) Food allergy (see above) Abdominal symptoms due to food allergy are more frequent in patients with atopic disorders, but are not restricted to them. Urticaria the majority of cases of urticaria cannot be shown to be due to IgE or any other allergic sensitivity. Those cases in which an allergic basis is found occur more often in atopic individuals (see Chapter 42). It occurs particularly in food handlers and slaughterhouse workers [17], and has been reported in health carers because of latex protein sensitivity [12]. True clearance rates are probably less than this, as around 25% of individuals relapse at some stage in adulthood. Factors that indicate a worse prognosis include severe childhood disease, early onset and a concomitant or family history of asthma or hay fever [8,11]. A German cohort study that followed 1314 children up to age 7 years suggested allergic sensitization to food and aeroallergens at 1 year of age as another important risk factor [11]. Disease onset is typically in early life (see Epidemiology), 60% in the first year and 85% before the age of 5 [16] and typically affects both sexes equally. Three disease modes are recognized: persistent disease (19%), intermittent disease (38%) and remitting disease (43%) [11]. The strongest predictive factors for the development of persistent disease include disease severity and a family history of atopy [11]. However, communityascertained cases may have a later age of onset than that reported in hospitalbased studies [17]. The reported prognosis differs considerably according to how the cases are selected, the criteria for diagnosis and many other variables. There is a general tendency towards spontaneous improvement throughout childhood and often some slight relapse during adolescence. Children with raised IgE antibodies to foods and inhalant antigens at 2 years of age may also have a poorer prognosis [18]. It seems that these poor prognostic factors may be underpinned by abnormalities of filaggrin structure and function [19]. Teenage patients with dermatitis have a high risk of persistent disease in adult life [20]. In addition, the atopic patient remains particularly at risk from occupational irritant hand dermatitis as an adult [21]. Disease prevention and occupational advice Disease prevention by the manipulation of allergen exposure of the mother, fetus and newborn child, altering the diet of the newborn child with supplements (omega3 or 6), prebiotics or probiotics or hydrolysed milk formulations, has been the subject of numerous trials. However, a comprehensive review of studies from the last decade showed no convincing evidence of benefit from any of these interventions [1] although a recent study of probiotics before and after pregnancy shows some benefit [2,3]. The focus has now shifted to the epidermal barrier and its protection and rapid healing with emollients from birth and vigorous early therapy should dermatitis appear to prevent the atopic march and development of autoimmunity [5]. A multicentre pilot study using once daily emollients from 3 weeks for 6 months in highrisk infants showed a 67% reduction in the development of active eczema [6]. This is often the time when adolescents are deciding what occupation they should undertake. Exposure of the skin to irritant chemicals and physical trauma should be avoided as far as possible. Severity Treatment for body Clear Emollients Mild Emollients Mild potency topical corticosteroids Moderate Emollients Moderate potency topical corticosteroids (use for axillae and groin flares for 7­14 days only) Night time sedating antihistamines (if sleep disturbed) Oral antibiotics (if clinically infected) Emollients Mild potency topical corticosteroids Night time sedating antihistamines (if sleep disturbed) Oral antibiotics (if clinically infected) Severe Emollients Potent topical corticosteroids (use for axillae and groin flares for 7­14 days only) Night time sedating antihistamines (if sleep disturbed) Oral antibiotics (if clinically infected) Emollients For severe flares, use moderate potency topical corticosteroids for 3­5 days only Night time sedating antihistamines (if sleep disturbed) Oral antibiotics (if clinically infected) Treatment for face and neck Emollients Emollients alone or mild potency topical corticosteroids National Institute for Health and Care Excellence [1]. Skin infections Dry skin Food allergens Contact allergens Exposure to pets or animals Airborne allergens ­ ­ Areas of skin affected Severity Dietary history Hay fever Food allergies ­ ­ ­ Part 4: Inflammatory Seasonal variation Response to previous treatment Current treatment Frequency of flares Frequency of skin infections ­ ­ ­ ­ ­ ­ reaction, but it can also be identified by culture, a Tzanck smear, an immunofluorescence slide test or electron microscopy. The clinical relevance of allergy to Malassezia yeast is indicated by studies showing that treatment with itraconazole to eradicate the yeast resulted in improvement of the eczema comparable with that obtained with betamethasone valerate [7,9]. Patch testing may also help to identify a contact allergen responsible for deterioration of the skin condition, particularly in adults [10] and topical drugs along with emollients are frequent sensitizers and should be included in the patch test series. Management [1­3] little value in routine screening tests in children with mild disease and without symptoms or signs of allergies [2]. In children with clear allergylike reactions (urticarial and/or acute abdominal symptoms), skin prick tests or specific IgEs can confirm antibodies against the suspect food. However, in eczema, the reaction may be nonIgE mediated and IgE measurement is unhelpful. The gold standard test is a doubleblind placebo controlled food challenge but this is rarely practical in clinical practice. There are numerous tests for food and aeroallergen beyond skin prick tests and serum IgE measurements. However, recent European guidelines recommend that food restriction should be used in patients with moderate to severe dermatitis who showed reactions with controlled oral food challenge [3]. A treatment strategy based on consistent advice and cooperation between health carers and the patient should be developed. However, recent years have seen the emergence of several new treatment approaches that hold promise for the near future. Examination should include an assessment of the whole skin to assess severity, complications and comorbidities, including eyes, lymph nodes and if required general medical examination of the respiratory and gastrointestinal systems. In all cases, emollients should be maintained during remission and in more severe cases maintenance of topical antiinflammatory therapy will be valuable to reduce the frequency of flares (see later). Sometimes oral sedating antihistamines and antibiotics may be added for short periods (when there is clinical evidence of infection.

The keratin aggregates are reminiscent of those in classical protein folding disorders such as neurodegenerative diseases like Huntington disease [6] hiv infection from mosquitoes best order monuvir. Cells expressing mutant keratin aggregates have increased sensitivity to hyperosmotic stress which can be reduced for example by the chemical chaperone trimethylaminenoxide [7] hiv infection rates in us buy 200 mg monuvir fast delivery. In neonates hiv infection rate oral buy monuvir with amex, the differential diagnosis therefore often includes epidermolysis bullosa antiviral ribavirin generic monuvir 200mg without a prescription. In the first months of life hiv infection rate in africa purchase monuvir 200mg line, the blistering resolves and hyperkeratosis develops instead. However, fragility of the skin remains and when patients suffer from fever or skin infections or are exposed in the summer to high ambient temperature or mechanical friction, bouts of blistering can occur. The older child and adult patients usually present with marked keratotic lichenification meaning rippled keratotic ridges, in par- ticular in the axilla, the elbows and the flexural aspects of the knees. It is striking that this severe involvement correlates with skin regions where the body temperature is somewhat elevated and thus this aggravation may be induced by differences in body temperature. As mentioned above, the ultrastructure of these diseases is characterized by collapsed keratin aggregates (tonofilaments). These aggregates often form around the cell nucleus, have lost their connection to the desmosomes and therefore promote intraepidermal blistering. As already discussed, the presence of keratin aggregate links the pathology to that of protein folding diseases. However, the course of the disease is milder and more localized, meaning that large parts of the body are clear. Outbreak of disease flares can be associated with high temperature in the summer, fever or pregnancy [3]. Congenital reticular ichthyosiform erythroderma Synonyms and inclusions · Ichthyosis variegata · Ichthyosis en confettis Pathophysiology (b) figure 65. Patients initially display generalized erythema and scaling with subsequent localized spontaneous healing which manifest with small pale white spots. Histology reveals perinuclear vacuolization and formation of bi nucleated cells, without keratin aggregates, while ultrastructural studies usually reveal shelllike perinuclear arrangement of keratins [4,5]. When these localized conditions were characterized by erythema and hyperkeratosis they were called erythrokeratoderma or erythrokeratodermia [1­3]. Connexins form gap junctions, which are aqueous intercellular channels that are found in all tissues of the human figure 65. Moreover, occurrence of both types of erythrokeratoderma sharing the same ultrastructure has been reported in siblings [4]. Symmetrical acrokeratoderma Clinical features A Chinese group reported a study concerning 34 cases of symmetrical acrokeratoderma. Here, brown to black hyperkeratotic plaques were symmetrically distributed over the acral regions with marked worsening of the condition in the summer and improvement during winter. Clinically, there is whitish hyperkeratosis on the back of both hands and fingers and the wrists in particular after 5 minute water immersion reminiscent of aquagenic keratoderma. However, the authors emphasized that their patients did not suffer from palmoplantar involvement that could be typical for cystatin A deficiency [2]. There are some distinct generalized cornification disorders that are very much characterized by a palmoplantar phenotype. Immunohistochemical staining revealed an altered distribution of the proteasome subunits. Affected individuals demonstrate keratotic punctuate plugs or papules that figure 65. There are no associated features, but there is a report of secondary squamous cell carcinoma [7]. Investigations Ultrastructure confirms the histological finding of hypergranulosis and shows abnormally large keratohyaline granules. Functional and ultrastructural data show that the defect manifests mainly within the basal and suprabasal layers of the epidermis characterized by expression of keratin 14. Initially, the wrong mouse model, namely bare patches (Bpa) was considered to be a mouse model for the disease [1]. However, molecular studies, 16 years later, showed that a very similar mouse model, namely tattered (Td) is the true homologue of the human phenotype, mapping to the short arm of the X chromosome and not to the long arm as Bpa. Recurrent infections especially in the flexures, can be troublesome, and scalp and eyebrow hair is sparse and lustreless. The ichthyosis improves in early childhood and the residual signs are often so subtle in adult life that an affected mother may be missed. Signs to be sought in older children and adults include swirls of fine scales, linear pigmentary change, patchy atrophy, follicular atrophoderma mainly on the limbs and dorsal hands, and a striate cicatricial alopecia, all in a Blaschkoid pattern. Other variable features include rounded or asymmetrical facies with frontal bossing and hypertelorism, a broad flat nasal bridge, congenital asymmetrical cataracts in 60% of patients, short stature, asymmetrical or, rarely, symmetrical shortening of limbs, kyphoscoliosis, supernumerary digits and other skeletal defects. Stippled calcification (asymmetrical) of longbone epiphyses, vertebrae, pelvis, carpus and tarsus, and cartilage, including trachea, is a characteristic but not universal radiological finding in the neonatal period, and usually resolves by adulthood. Patients have normal or mildly impaired intellectual development and neural hearing loss have been reported. The effect of retinoids is unknown and the need for treatment diminishes with age. Continued orthopaedic surveillance and appropriate procedures may be indicated for skeletal anormalies. The ichthyosis is probably caused by both cholesterol deficiency and accumulation of toxic sterol metabolites. The genetic defect is associated with metabolic alterations in the serum, namely markedly elevated levels of 8dehydrocholesterol and of cholest8(9)en3ol that can help to identify somatic mosaicism even in clinically unaffected males. However, the extent of the metabolic alterations detected in serum does not allow the prediction of the severity of the clinical phenotype [4]. The disease is characterized by anticipation, namely worsening of disease severity in subsequent generations [7]. Two mouse Xlinked dominant malelethal traits, bare patches (Bpa) and striated (Str) had previously been associated with mutations in nsdhl and serve as animal models for this disease [4]. These mouse models revealed that Nsdhl deficiency has a deleterious effect on hedgehog signalling in early placental development, since male embryos for several mutant Nsdhl alleles die in midgestation with a thin and poorly vascularized placenta [5]. Associated ipsilateral extracutaneous defects in the form of hypoplasia or aplasia may involve the limbs and other skeletal structures as well as internal organs such as the lung, heart and kidney [1]. Although most reports deal with sporadic cases ­ around 60 cases had been reported by 2006 ­ this may be an underestimation of familial occurrence. It is of note that the majority of cases affect the right side of the body, but leftsided cases have also been reported [7]. Simple dermabrasion has been shown to fail and to be associated with recurrence of the naevus [8]. In contrast, dermabrasion followed by immediate covering with splitskin grafts from the unaffected contralateral side has been effective for longterm therapy and has been interpreted Xlinked syndromes concerning distal cholesterol biosynthesis 65. Recently, a pathogenesisbased topical therapy aiming at suppression of epidermal cholesterol biosynthesis and simultaneous application of topical cholesterol in a cream has been reported with excellent clinical response [10]. It is of note that only missense mutations and intron mutations partially affecting transcription [8] are known so far. Psoriasiform plaques, angular cheilitis, periungual inflammation, dystrophic nails, hypohidrosis and atopic eczema can be present [9]. Superficial corneal ulceration and vascularization leads to progressive corneal scarring and underlies photophobia, the third cardinal feature [9]. Neurological features include mental retardation and seizures as well as olivocerebellar atrophy, malformation of the temporal lobes, mild inner cerebral atrophy and hypoplasia of the corpus calllosum [10,11]. Female carriers can present with much milder symptoms such as cutaneous hyperkeratotic lesions that follow the lines of Blaschko or asymmetrical distribution of body hair or Blaschko linear presentation of hypohidrosis that can be visualized by testing, but otherwise goes unnoticed [2,11]. All patients have the triad of follicular ichthyosis, congenital atrichia of the scalp (absence of hair) and photophobia. In particular as neonates, they present with generalized follicular keratosis over the entire body including the scalp. It can improve markedly management A moderate response to lowdose acitretin has been reported [13]. Intensive lubrication of the ocular surface remains the mainstay of therapy for photophobia. The disease features associated symptoms such as lifethreatening neonatal hypernatraemic dehydration, failure to thrive and recurrent infections [1,2,3]. The protein is organized into 15 potential inhibitory domains with a four/sixcysteine residue pattern (Kazaltype like/Kazaltype). Subsequent processing creates several inhibitors with different target specificities [7,8]. Reduction of serine protease inhibition not only leads to overdesquamation of corneocytes and degradation of desmosomal proteins. Clinical features [1,2,17,18­22] Clinical diagnosis requires a combination of congenital erythroderma, neonatal failure to thrive and early development of atopy with high levels of IgE and hypereosinophilia. Children may develop rare, thin, spiky and fragile hair of slow growth, but interindividual differences are striking. Recurrent urticaria and facial angiooedema, triggered by certain foods, are common complications, although the incidence varies [23]. However, most of these infants begin to gain weight in their second year, although they generally remain below the 25th centile for height and weight. Perinatal complications include hypernatraemic dehydration, severe infections and malnutrition due to high calorie consumption and enteropathy. In around 90% of the cases, diagnosis can be confirmed by SpinK5 sequence analysis [17], which might be important for prenatal diagnosis of siblings [39,40]. The impaired epidermal barrier is a major clinical problem also including the risk of systemic toxicity from topically applied agents. Newborns are prone to hypernatraemic dehydration and/or systemic sepsis, and may need intensive medical care immediately after birth. Consequent strengthening of the skin barrier relies on regular bathing, emollients and ointments (paraffinbased ointments, such as 50/50 white soft and liquid paraffin). Topical steroids should be avoided as far as possible or only used for a short period [43]; topical antiinflammatory immunomodulators (pimecrolimus 1% or tacrolimus 0. Type I hypersensitivity reactions, in particular food allergies to fish and nuts, should be prevented by dietary restrictions or may be treated specifically [50]. Hypotrichosis tends to improve after puberty; however, especially girls may profit from wearing a wig. So far, it is unclear whether ex vivo lentiviral gene therapy [53,54,55] or polypeptide replacement therapy might offer a specific therapy to patients in the future [17]. On histology, psoriasiform dermatitis with parakeratosis, acanthosis and a peculiar eosinophilic material just below the stratum corneum, are often observed. Often disregarded as artefactual, subcorneal or intracorneal separation can consistently be found and is a diagnostically useful hint [36]. Microscopic examination of the hairs usually leads to a rapid diagnosis: trichorrhexis invaginata refers to the protrusion of the distal part of the hair shaft into the cup shape of its proximal part [2]. Inactivation of the gene induces a lethal epidermal barrier disruption and hair follicle degeneration [15]. Clinical features [1,2,3,4,18­23] Inflammatory peeling skin disease presents at birth or a few days later. Corneodesmosin adhesive properties are attributable to glycinerich domains, which (b) figure 65. The disease persists throughout life and is often accompanied by significant atopic manifestations. Investigations Histopathology reveals subcorneal splitting and/or enhanced detachment of corneocytes. Clinical features Differential diagnosis Hypotrichosis and failure to thrive seems unusual or less severe than in Netherton syndrome [4]. Neuroichthyotic syndromes the combination of neurological manifestations and ichthyosis can be found in at least 16 distinct genetic disorders (reviewed in [1]). In mildly affected patients, cutaneous symptoms may not be apparent, or the ichthyosis may have a late onset. Allergies need to be prevented; tacalcitol cream [27], emollients with dexpanthenol and antiseptics or use of thermal water spray can be tried. In a fivegeneration Canadian pedigree, erythrokeratoderma appearing in infancy and clearing in later life was associated with lateonset ataxia and neuropathy [16]. The autosomal dominant disorder seems to belong to the group of channelopathies affecting calcium homeostasis in varies tissues [18,19]. Clinical features [1,2,5,6] the disease is characterized by superficial painless peeling of the skin predominantly on the dorsal aspects of the hands and feet. In infants, it frequently manifests with blistering on the palms and soles and is aggravated by mechanical factors and by humid warm environments. Differential diagnosis Acral peeling skin syndrome should also be distinguished from keratolysis exfoliativa [9,10]. This apparently common but underdiagnosed condition affects young adults, usually in the summer months and may be related to sweating. Revised nomenclature and classification of inherited ichthyoses: results of the First Ichthyosis Consensus Conference in Sorèze 2009. Phytanic acid is derived from plant chlorophyll and cannot be synthesized by human tissues. It replaces other fatty acids in lipidrich tissues thus interfering with membrane structure and function. On histological examination many of the basal cells are often vacuolated and special lipid stains such as oil red O stain will reveal numerous fat globules within the basal cell layer and other keratinocytes [8]. A first neurological sign is often that children can no longer sit unsupported and lose their communication skills. The major dietary exclusions are green vegetables (phytanic acids) and animal fat (phytol) and the aim of the dietary treatment is to reduce daily intake from the usual level of 50 mg/day to less than 5 mg/day.

Routine management is indicated for complications such as refractive errors hiv infection rates los angeles monuvir 200 mg fast delivery, emphysema hiv infection no fever buy monuvir 200 mg fast delivery, hip dislocation hiv transmission route statistics order monuvir with visa, inguinal hernias and seizures hiv infection rates europe order monuvir 200 mg on-line. A blocker or angiotensinconverting enzyme inhibitor may be indicated if dilatation of the aortic root is identified antiviral resistance definition 200mg monuvir otc. There may also be agenesis of the corpus callosum, joint laxity, hypotonia, tortuosity of blood vessels and facial dysmorphism. At the milder end of the phenotypic spectrum, geroderma osteodysplasticum is characterized by progeroid skin wrinkling mainly on the hands, feet and abdomen presenting in infancy or early childhood [27,28]. There is osteoporosis and bony fractures, and there may be hernias or hip dislocation. Copper histidine therapy may diminish the phenotypic severity of Menke disease if given within the first 2 months of life [31]. Surgical management of aneurysms and other cadiovascular anomalies may also be warranted, as may botulinum toxin injections and plastic surgery for facial involvement by cutis laxa [32,33]. These conditions have diverse clinical and genetic features and require detailed conditionspecific knowledge, along with specific treatment guidelines and plans. They, however, are united by the common features of extensive and diverse skin manifestations along with somatic hamartomas and a significant risk of cutaneous and non cutaneous neoplasia. Introduction and general description [1­3] In 1882, Friedrich von Recklinghausen published a monograph describing this disease and pointing out that the skin tumours were derived from peripheral nerves [4]. In retrospect, Virchow first reported a family with more than one affected member [5]. The mode of inheritance is autosomal dominant, with almost 100% penetrance by the age of 5 years [3,6]. Sporadic cases result from a high gene mutation rate and account for up to 50% of all cases [1­3]. The gene spans 335 kb and has at least 59 exons, producing four major alternatively spliced transcripts. No hotspot for mutations has been identified, meaning that each affected individual and family has specific mutations. The impact of these mutations is effective haploinsufficiency for neurofibromin; that is only 50% of the normal protein is produced by cells. Schwannomatosis is a syndrome of peripheral nerve tumours and pain that is genetically poorly understood; it has no dermatological features and so likewise will not be discussed here. Neurofibromin has been shown to be present in both keratinocytes and melanocytes in normal adult human skin [16]. Pathophysiology Cutaneous neurofibromas are derived from peripheral nerves and their supporting structures, including neurilemmal cells. Ultramicroscopically, they are seen to consist of arborizing Schwann cells in collagenous interstitial tissue. In both caféaulait spots and clinically unaffected skin, giant pigment granules are occasionally found in epidermal cells and melanocytes [20­24]. They can, however, be found in other conditions, and their presence cannot be regarded as pathognomonic. Clinical features [1,2,25­27] the National Institutes of Health Consensus Development Conference Statement, developed in 1988, has proved to be very useful and is widely employed in clinical practice [28]. Lisch nodules (pigmented iris hamartomas) appear as domeshaped lesions found superficially around the iris on slit lamp examination. Oral lesions are present in 5­10% of cases, as papillomatous neurofibromas of the palate, buccal mucous membrane, tongue and lips, or as macroglossia, which is usually asymmetrical [33]. Earlyonset, highlevel lesions may progress inexorably, leading to cardiorespiratory disease, unless aggressive surgery is performed. Pseudoarthrosis involving the tibia or radius occurs in 1%, but may be asymptomatic [26]. Recently, in addition to the wellcharacterized skeletal abnormalities, a generalized bone metabolic defect due to loss of function of neurofibromin has been identified [35]. The severity of cutaneous involvement gives no reliable indication of the extent of the disease in other organs. Between 25% and 30% of children may exhibit learning difficulties [29,37] and physical development may be impaired. Endocrine disturbances of many types may be associated [39]: precocious puberty, acromegaly [40], Addison disease, hyperparathyroidism, gynaecomastia and phaeochromocytoma. Osteomalacia when present is the result of a congenital defect of the renal tubules. The most common solitary intracranial tumour is an optic nerve glioma; astrocytomas and schwannomas also occur. Intracranial tumours may cause epilepsy, although seizures may occur in the absence of any demonstrable focal lesion. Cutaneous neurofibromas (previously termed mollusca fibrosa) are soft, lilacpink tumours, sessile and dome shaped, and sometimes pedunculated. These lesions are most numerous on the trunk and limbs; hundreds may be present, ranging from a few millimetres to several centimetres in diameter. Blue red macules and pseudoatrophic macules also occur [30] and are often variants of neurofibromas. The plexiform neurofibroma is a diffuse, elongated fibroma along the course of a nerve, frequently involving the trigeminal or upper cervical nerves and usually noticeable within the first 2 years of life. Elephantiasis neurofibromatosa is a similar diffuse neurofibromatosis of the nerve trunks associated with overgrowth of the subcutaneous tissue and of the skin, which is wrinkled and pendulous and may produce gross disfigurement. It is present in about 70% of affected subjects and appears a little later than the caféaulait spots, the youngest case in one series being 3 years old [29]. There may also be darker pigmented patches over an underlying plexiform neurofibroma, and if these extend to the midline of the spine it may indicate that the tumour involves the spinal cord [32]. Enlargement or pain should suggest the possibility of malignant change, although rapid enlargement may also occur secondary to intralesional haemorrhage. The presence of large numbers of mast cells in the skin in this condition, and the response of the itching to antihistamines, suggest that histamine is the cause of the pruritus [32]. In addition, a beneficial effect of the mast cell blocking agent ketotifen has been reported [17]. The detection of an asymptomatic brain lesion will increase patient and parental anxiety and would not alter clinical management. The ideal situation is a multidisciplinary clinic, now established in a number of centres [61,62]. Molecular genetic testing is feasible, but the large size of the gene and wide range of pathogenic mutations have so far impeded the widespread diagnostic use of genetic testing [66]. In routine practice molecular testing is not necessary but can be very useful in cases where the clinical picture is unclear. Cutaneous neurofibromas are clinically and histologically distinctive, although a plexiform neurofibroma in an infant can clinically resemble a congenital melanocytic naevus. Caféaulait spots, usually the earliest manifestation in children, are present in 10­20% of normal individuals and about 35% of patients with McCune­ Albright syndrome (Table 80. However, in a disorder showing such varied expression and complications, the decision to undergo prenatal diagnosis is far from clear. Prenatal diagnosis is also not an option for the approximately 50% of cases who represent new mutations. Characteristically, caféaulait spots are present at birth or, more commonly, develop in early childhood and increase in number throughout life. Cutaneous neurofibromas appear during childhood and increase rapidly in number at puberty, suggesting a possible hormonal influence. Although early onset and rapid progression before puberty usually indicate a poor prognosis, minimal cutaneous involvement in the young child does not necessarily imply a favourable course, although many cases remain limited. Extensive involvement of the urinary or gastrointestinal tract or the central nervous system carries a poor prognosis. Pregnancy, in which unexplained hypertension frequently occurs, sometimes appears to induce rapid progression of existing lesions and the development of new ones [26,60], again suggesting hormonal sensitivity. At presentation, a detailed clinical assessment is essential and must include examination of all other members of the family. Suggested investigations should include a neurophysiological assessment, a skeletal survey, audiography and slit lamp ocular examination. Parents and siblings should also have their eyes examined for the presence of Lisch nodules. Carbon dioxide laser surgery is a treatment modality for cutaneous neurofibromas, but hypertrophic and atrophic scars can result and a preliminary test treatment is recommended [68]. Surgery is also indicated when an increase in size and pain suggests possible malignant change. Epilepsy should be thoroughly investigated, as neurosurgical relief is sometimes practicable. Adolescence is a particularly difficult time when neurofibromas may grow rapidly in response to hormonal changes. It should be made clear to patients that 50% of their children are likely to be affected and the disease may be severe. Juvenile chronic myeloid leukaemia is a rare type of leukaemia and accounts for about 1­2% of childhood leukaemias. Segmental neurofibromatosis this condition is characterized by caféaulait spots, cutaneous neurofibromas and sometimes visceral neurofibromas, limited to a circumscribed body segment [1­7]. Those with significant complications will be followed up as appropriate through the nationally funded Complex Nf1 Service. Because these various disorders affect the same signalling pathway, they share many phenotypic features, including cardinal cutaneous manifestations such as skin tumours, and pigmentary and hair abnormalities (see Chapter 68) [2]. Rayer [2] gave the first description of the fibrovascular papules, and Bourneville [3] reported the case of an intellectually impaired girl who also suffered from hemiplegia and epilepsy. He did not recognize her facial eruption or kidney tumour as being part of the disease. More recent studies have shown the incidence to be 1 in 10 000 in the Oxford region [5] and 1 in 27 000 in the west of Scotland [6]. This suggests that some of the biological functions of tuberin and neurofibromin are similar. In many lesions, for example angiomyolipoma of the kidney, there is malformation of vascular and mesenchymal tissue. The lesions are slow growing and tend to produce symptoms by pressure effects, although occasionally there is haemorrhage from a vascular lesion. The shagreen patches show no other change and cannot be identified on histological grounds only. Angiofibromas (formerly misnamed adenoma sebaceum) consist of hyperplastic blood vessels and sebaceous glands of immature hair follicles. Collagen synthesis is increased in the angiofibroma, although total collagen content is decreased, suggesting that there may be an increased turnover of collagen [21]. Histopathology of the periungual fibromas shows a distal part with loose collagen and many blood vessels and a larger proximal part composed of dense collagen bundles and fewer capillaries [22]. The white ashleafshaped macules contain abnormal melanocytes with reduced tyrosinase activity [23], and electron microscopy shows defective melanization of the melanosomes [24,25]. The characteristic tuberosclerotic nodules of glial proliferation may occur anywhere in the cerebral cortex, basal ganglia and ventricular walls, but are rare in the cerebellum, medulla or cord [20]. Renal tumours of embryonic type, usually multiple, subcapsular and benign, are found in about 80% of cases at postmortem but are frequently asymptomatic. The angiomyolipoma is the characteristic lesion but cystic renal disease also occurs [26]. The socalled congenital rhabdomyoma of the heart is an abnormal and premature differentiation of embryonic myocardium into atypical Purkinje cells. The lungs may show interstitial fibrosis or fibroleiomyomatosis with cystic changes [27­29]. Onset before the age of 5 years with cutaneous changes or with epilepsy is usual, although the disease may remain latent until adolescence or adult life. Firm, discrete, red brown, telangiectatic papules, 1­10 mm in diameter, extend from the nasolabial furrows to the cheeks and chin, and are occasionally found in the ears. They may be numerous and conspicuous, and very rarely may form large cauliflowerlike masses. In many cases they are easily overlooked, being confined to a small area on each side of the nose or the chin. Most of the lesions are hamartomas, and in many organs the cells resemble embryonic cells, suggesting that the defect occurs at an early stage Tuberous sclerosis complex 80. They are a valuable physical sign as they may be found at birth or in early infancy, some years before other signs of the disease develop, and may suggest the correct diagnosis in infants with convulsions. Fibromatous tumours are occasionally present on the gums and palate and rarely are found on the tongue, larynx and pharynx [47]. Learning difficulties are present in 60­70% of cases and may be progressive, but if intellectual development has been normal throughout childhood subsequent deterioration is uncommon [34]. Some cases have presented gross behaviour disorders, although they have been of normal intelligence. In particular, selfinjury behaviour is quite common, occurring in up to 10% of patients [49]. Epilepsy is seen in almost all intellectually impaired patients and in some 70% of those with average intelligence [51]. It usually begins in infancy or early childhood, thus often preceding the skin lesions by many years. Symptoms and signs of raised intracranial pressure usually result from obstruction by a tumour at the foramen of Monro. The proportion of cases showing abnormal electroencephalographic findings is high and increases with age, but there is no diagnostic pattern. Retinal phacomas are seen as white streaks along the vessels or as small, rounded tumours near the disc. Hypopigmented spots in the iris also occur and these may be analogous to the ashleaf macule in the skin [54]. Cardiac and renal tumours are often asymptomatic unless by reason of their size or site.

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