Gary L. Clayman, MD, DMD, FACS

• Alando J. Ballantyne Distinguished Chair of Head and Neck Surgery
• Professor of Surgery and Cancer Biology
• Director of Interdisciplinary Program in Head and Neck Oncology
• Chief, Section of Head and Neck Endocrine Surgery
• Deputy Head Division of Surgery, University of Texas MD
• Anderson Cancer Center
• Houston, Texas

Other associations reported include myelodysplastic syndrome [19] antimicrobial gloves buy discount vantin on-line, lymphoma antibiotics for upper sinus infection vantin 200 mg buy on line, leukaemia [20] antibiotics classes buy 200 mg vantin visa, malignant eccrine poroma [21] virus free screensavers generic vantin 100 mg on line, malignant fibrous histiocytoma [22] and annular pancreas with duodenal stenosis [23] infection behind ear lobe vantin 100 mg online. Differential diagnosis the essential features in differential diagnosis are the age of onset and the distribution of the poikiloderma, which is most intense on lightexposed skin but not necessarily confined to it. In progeria, the child is often small but otherwise normal during the first year; thereafter development is delayed. Scalp hair, eyebrows and eyelashes are lost and the skin assumes an increasingly senile appearance. In Cockayne syndrome, light sensitivity is a conspicuous feature after the first year, but there is no poikiloderma. In Kindler syndrome, skin fragility is present in the early years ahead of the development of poikiloderma, and photosensitivity is variable. Characteristic fine, atrophic scarring and limited webbing of the digits occurs from adolescence onwards, and gingival involvement may lead to marked periodontal disease and dental loss. Telangiectasia, often irregular, linear and present at birth, is a feature of focal dermal hypoplasia. The cheeks are first and most severely involved, but the forehead, chin and ears seldom escape. The hands, forearms and lower legs are next affected, and the buttocks and thighs are frequently involved. Light sensitivity is a feature of many cases, and exposure to sunlight may extend the distribution of the eruption on the upper trunk; however, it is not limited to lightexposed skin, and the poikiloderma may develop without preceding erythema. Light sensitivity may be so severe that a bullous response is elicited, and although this tends to diminish after early childhood, it may persist into adult life [14]. Once fully developed in early life, the skin lesions tend to remain unchanged, but in many cases keratoses develop on exposed skin from adolescence onwards, and large warty keratoses of the hands, wrists, feet, ankles and elsewhere may occur [15]. Squamous or basal cell carcinoma may develop in the keratoses or in the surrounding atrophic skin [16]. Scalp hair, eyebrows, eyelashes, and pubic and axillary hair are often sparse or absent. Prognosis Life expectancy depends on the development of an associated malignancy; otherwise it appears to be normal. Baseline radiography of the long bones by the age of 5 years has been recommended since underlying skeletal dysplasias can make Xray interpretation difficult if there is a later suspicion of osteosarcoma [11]. Telangiectasia, especially on the face, can be improved significantly by treatment with the vascular pulsed dye laser [25]. The function of the gene product is currently unknown, but is expressed in numerous tissues including skin and skeletal muscle [1]. Histopathology of the skin shows the loss of adnexal structures due to fibrosis and elastic degeneration and globules in the papillary dermis [2]. It is associated with neutropenia, respiratory infections and susceptibility to myelodysplasia and leukaemia. Later, there may be more sclerodermatous skin changes and reduced sweating, which can lead to overheating. There is marked alopecia of the scalp, eyelashes, eyebrows and body hair, but nails and teeth are normal. In the first decade, progressive tendon contractures of the lower and, in some cases, upper limbs develop. Myopathy also starts in the early years with atrophy with fatty infiltration of skeletal muscle. Some affected individuals develop progressive pulmonary fibrosis leading to breathlessness and diminished pulmonary function, which may be fatal in adulthood. It is characterized by generalized poikiloderma with accentuation in the flexures and sparing of the face, scalp and ears, sclerosis of the palms and soles, linear hyperkeratosis and sclerosis of the flexures, and finger clubbing. Tissue calcinosis, Raynaud phenomenon and cardiac abnormalities have also been described [1,3]. Synonyms and inclusions · Hereditary sclerosing poikiloderma Clinical features Skin manifestations usually start in the first 6 months of life with erythematous, eczematous or ichthyosiform changes on the limbs, subsequently spreading more centrally and being replaced by poikiloderma [2­4,5]. The nails show an early onset of pachyonychia and there may be an associated palmoplantar keratoderma. The presence of neutropenia is variable and may be cyclical [2,3], and myelodysplasia or acute myeloid leukaemia may occur [5,7]. Recurrent airway infections with chronic cough and reactive airway changes are common, and otitis media has also been described [3]. Targeted nextgeneration sequencing appoints C16orf57 as Clericuziotype poikiloderma with neutropenia gene. Hereditary sclerosing poikiloderma: report of two families with an unusual and distinctive genodermatosis. Mutations in dyskeratosis congenita: their impact on telomere length and the diversity of clinical presentation. Cells have evolved a number of complex and effective systems, including nucleotide excision repair, double strand break repair and mismatch repair, to recognize and repair this damage in actively transcribed genes. About half of affected individuals also show an exaggerated and prolonged sunburn response on minimal exposure. The initial report of this disorder was made by Hebra and Kaposi in 1874 [3] and the term xeroderma pigmentosum, meaning pigmented dry skin, was introduced in 1882 [4]. He discovered deficient excision repair in cultured skin fibroblasts from these patients [7]. This suggested that patients had different defects in nucleotide excision repair, and one defect could be corrected by the fusion of cells from a patient with a different defect because of the availability of the protein that the other was lacking. The prevalence is higher in North Africa and the Middle East, especially in communities in which consanguinity is common. Amid Indian and Middle Eastern areas, the incidence is quoted at one per 10 000­30 000 [18­21]. Pathophysiology Xeroderma pigmentosum is an autosomal recessive disorder and results from mutations in any one of eight genes. Delayed diagnosis and poor sun protection will exacerbate the cutaneous features, resulting in significant pigmentary changes, multiple skin cancers and a worse prognosis. The lentigines are fixed and progress over time to become more dense and irregular. Prolonged corneal exposure can result in corneal scarring and Xeroderma pigmentosum 78. The age at onset and rate of progression of the neurological abnormalities is variable between and within different complementation groups. In the absence of functional repair, the lesions persist and result in neuronal cell death. Cerebellar signs manifest usually between 4 and 16 years of age, commonly dysarthria and difficulties with balance. Nerve conduction studies show evidence of axonal sensory and motor neuropathy although this is not usually seen before the second decade of life. Magnetic resonance imaging demonstrates atrophy of the cortex of the brain with concomitant dilatation of the ventricles, and a secondary thickening of the skull bones. Patients eventually become wheelchair and then bedbound, a few years before death [46]. Other psychological issues include the potential for developing anxiety and depression from the high risk of potentially fatal skin cancers, ongoing surgical procedures for skin cancers, many on the face, with associated disfigurement, and the possibility of neurodegeneration in some complementation groups. The overall median age of death is reported as 32 years [39], with skin cancer and neurodegeneration the main causes of death. Sun avoidance and regular followup to assess and treat any skin cancers increases life expectancy. Investigations In most cases, a clinical diagnosis can be made on the presence of extreme and exaggerated sunburn reactions in those individuals who show this feature, or on the appearance and progressive development of lentigines on the face and other exposed site from an early age. Skin fibroblast cultures are established from a 4 mm punch biopsy taken from an unexposed area of the skin. This can give further insight into genotype­phenotype correlations and enable genetic counselling and prenatal testing if requested. The disease is defined by progressive postnatal growth failure, short stature, microcephaly, cachexia, abnormal development, photosensitivity, premature ageing, retinal degeneration and sensorineural deafness [2]. Regular skin and eye review and appropriate and early management of any cancers is essential. Topical 5fluorouracil and imiquimod may be useful for early or premalignant lesions. Photodynamic therapy should not be used as the irradiation involved is likely to result in further skin damage and carcinogenesis [55]. Psychosocial issues including social isolation from peers at school and at home, limited career prospects and the impact of meticulous sun protection on the quality of life need to be addressed. Animal studies using viral vectors have also established that gene therapy approaches for patients with this disease may become possible [56,57]. Age Photosensitivity is present from birth and the abnormal growth and development becomes evident within the first few years of life. It is characterized by short stature, photosensitivity, a distinctive facial appearance, ocular defects, premature ageing and progressive neurological dysfunction associated with extensive demyelination. Neurological features comprise of extensive demyelination of the peripheral and central nervous system, microcephaly, progressive cognitive decline, choreoathetosis, hydrocephalus and spasticity. Ophthalmological problems include retinal degeneration, cataracts and optic atrophy leading to loss of vision [15]. There is progressive sensorineural deafness and skeletal abnormalities with flexion deformity [16]. The skin is dry and thin, and the hair is often sparse and is sometimes prematurely grey Cerebrooculofacioskeletal syndrome. Clinically it is characterized by congenital microcephaly, congenital cataract and/or microphthalmia, arthrogryposis, severe developmental delay, growth delay and facial dysmorphism (prominent metopic suture, micrognathism). The axial hypotonia contrasts with the peripheral hypertonia and is associated with feeding difficulties. Peripheral neuropathy, sensorineural hearing loss and pigmentary retinopathy can be observed. Survival beyond the second decade is unusual and the mean age at death in reported cases is 12. Other clinical features include photosensitivity in about half of the affected individuals, ichthyosis, developmental delay, short stature, haematological abnormalities, skeletal abnormalities and maternal pregnancy complications [5]. A clinical diagnosis can be made based on the presence of short stature, photosensitivity, distinctive facial appearance, ocular defects and premature ageing. Early cerebral imagery is not very specific, but it can reveal cerebral and cerebellar atrophy. Diffuse myelinization anomalies and calcifications of the basal ganglia can appear secondarily. Ethnicity It has been reported to occur in many ethnic groups worldwide although it is more common in populations where consanguinity is frequent. Other common features are developmental delay/intellectual impairment (85% of cases), short stature (73%) and facial dysmorphism with microcephaly, large ears and micrognathia. Ocular abnormalities occur in about 50% of cases and include congenital cataracts, nystagmus and strabismus [21]. Patients gradually develop joint abnormalities with contractures and dislocations. Many patients are anaemic and neutropenic and show haematological features of thalassaemia trait [22]. Severe and recurrent infections, especially respiratory, occur in the first year of life. The spectrum of clinical features varies from mild disease with only hair involvement to severe disease with profound developmental defects and recurrent infections [5,23]. The overall median age of death is reported as 3 years [5], with pneumonia and other infections (especially sepsis) being the main causes of death. This can give further insight into genotype­phenotype correlations and enable genetic counseling and prenatal testing if requested. It is clinically heterogeneous and characterized by congenital developmental defects, earlyonset bone marrow failure and a high predisposition to cancer. Twothirds of patients are born with congenital malformations of the kidneys, heart and skeleton (absent or abnormal thumbs and radii). Other features include a typical facial appearance with small head, eyes and mouth, hearing loss, hypogonadism and reduced fertility. Cutaneous abnormalities include reticulate or patchy hyper or hypopigmentation and caféaulait spots. Subsequently, patients develop tumours such as lymphomas, oesophageal carcinomas, squamous cell carcinomas of the head and neck, liver and brain tumours, and acute myeloid leukaemia [2]. Diagnosis is based on the evaluation of chromosomal breakage induced by alkylating agents such as mitomycin C. Bone marrow failure and cancers results in a poor prognosis and the life expectancy of patients is reduced to an average of 20 years [2]. Haematopoietic stem cell transplant is curative for the haematological features but this increases the risk of solid tumours, which must be monitored. Management Management requires a multidisciplinary approach with input from obstetrics, paediatrics, genetics, ophthalmology, neurology, orthopaedics, infectious diseases and radiology. Patients and their families should be given appropriate genetic counselling and prenatal diagnosis offered if required. It is a multisystem disorder characterized by ataxia and mucocutaneous telangiectasia. Telangiectasia initially appears in the conjunctiva and is most prominent in the facial areas. Additional cutaneous features include premature hair greying, caféaulait spot and pigmentary changes, including poikiloderma. Management is symptomatic and involves a multidisciplinary approach with input from physiotherapy, speech therapy, neurology and early treatment of infections. The prognosis is poor because of severe respiratory infections, progressive neurodegeneration and an increased risk of cancer.

Collodion membrane may confer to the skin an appearance that can be confused with the skin of patients with restrictive dermopathy bacteria 4 plus cheap vantin 100 mg visa. Sclerema neonatorum should also be considered in the differential diagnosis of restrictive dermopathy antibiotics for sinus infection nz vantin 100 mg. Epidemiology Disease course and prognosis Death usually occurs within the first week of life due to respiratory failure [10] antimicrobial definition buy vantin no prescription. Incidence and prevalence Restrictive dermopathy is very rare with approximately only 60 cases published [1] antimicrobial jiu jitsu gi purchase generic vantin line. Investigations Radiological investigations for skeletal changes antimicrobial body wash purchase vantin 100 mg without a prescription, skin biopsy and molecular analysis. The dermal­epidermal junction is flat, with a thin dermis, and a thick layer of subcutaneous fat. The collagen bundles appear stretched, and orientated in parallel lines, as they are in a tendon [4,5]. Although progressive senile degeneration occurs, many of the more common features of ageing, such as cataracts, presbycusis and presbyopia, are not seen. Clinical features Presentation [6­9] It is characterized by intrauterine growth retardation and premature birth, due to ruptured fetal membranes. The typical facies comprise a small, fixed, round, open mouth, micrognathia, small nose with choanal atresia/stenosis, lowset ears and widely spaced cranial sutures. Skeletal changes include enlarged fontanelles, clavicular dysplasia and reduced bone density. The joints are all fixed in flexion, and there is gross restriction of the respiratory movements. Respiratory insufficiency and secondary infections cause death within a few weeks from birth. Introduction and general description Progeria is derived from the Greek word geras, meaning old age. Although death usually occurs in the second decade as a result of severe generalized atherosclerosis, Hutchinson­Gilford progeria syndrome is considered a segmental ageing syndrome as some of the other typical features of ageing, such as cataracts, presbycusis, presbyopia, increased incidence of cancer and dementia do not occur. Scanning electron microscopy of hairs from one patient showed unusual longitudinal depressions with minor cuticular defects [6]. The bones show a variety of changes including osteolysis, osteoporosis, necrosis, dislocations and poorly healing fractures [9,10]. Ethnicity Approximately 150 cases have been reported with a significant majority in Caucasians. By the second year of disease, the skin has become thin, taut and shiny in some areas but lax and finely wrinkled in others. After several years, progressive mottled hyperpigmentation develops, most marked on exposed sites, but there is no photosensitivity. Thickened sclerotic areas may be present on the lower trunk or thighs, and in one case multiple keloids developed on the hands and arms [6]. This results in genomic instability, decreased cell proliferation and premature cell senescence and death [2­4]. Pangeria (Werner syndrome) Stature Facies Small stature; cessation of growth at 12 years Beaked nose; skin of ears atrophic and tightly bound down giving birdlike facies Progeria (hutchinson­Gilford syndrome) Small stature Birdlike facies with protruding ears, beaked nose, thin lips with centrofacial cyanosis, prominent eyes, frontal and parietal bossing with pseudohydrocephaly, mid face hypoplasia with micrognathia and large anterior fontanelle; prominent frontal tuberosities and scalp veins Dry, thin and wrinkled with progressive mottled pigmentation; may present with sclerodermalike changes on limbs; eccrine sweating is decreased Hair lost in first 2 years of life Prominent eyes; otherwise normal Thin and brittle Prominent joints; coxa valga; generalized subcutaneous fat loss; poorly developed muscular system; no acrosclerosis or Raynaud phenomenon acrogeria (Gottron syndrome) Usually normal but some have low birth weight and short stature Micrognathia; atrophy of skin on tip of nose Skin Dry atrophic skin; mottled hyperpigmentation and telangiectasia particularly over limbs face and neck. Premature greying at 20 years; loss of hair at 20­25 years Bilateral juvenile cataracts (20­30 years); keratopathy; glaucoma Normal More generally affected than trunk; sclerodactyly; restricted movement of joints; lower limb ulcers; hyperkeratosis over bony prominences; generalized loss of subcutaneous fat Atrophic transparent skin with telangiectasia and mottled hyperpigmentation on extremities. Easy bruising and prominent veins Normal Normal Dystrophic or thickened Atrophy of skin most marked on extremities; no leg ulcers. Werner syndrome Definition and nomenclature Werner syndrome is an inherited premature ageing disorder in which the ageing process is accelerated, starting after puberty. Cutaneous changes include atrophy, loss of cutaneous fat, wrinkling, canities (greying of the hair), hair loss, nail dystrophy, defective pigmentation, poikiloderma, sclerosis and ulceration. Synonyms and inclusions · Pangeria · Adult premature ageing syndrome Differential diagnosis Other progeroid syndromes that share some similarities include mandibuloacral dysplasia (see p. Stunting of growth from an early childhood is associated with senile changes in the skin but normal scalp hair in gerodermia osteodysplastica [21] (see Table 72. Gerodermia osteodysplastica, wrinkly skin syndrome and autosomal recessive cutis laxa type 2 show some phenotypic overlap [22­24]. Cockayne syndrome (see Chapter 78) may cause confusion, but progeria is distinguished by the loss of hair, the lack of photosensitivity and ocular changes, and the absence of disproportionately large extremities. The firm skin of sclerema neonatorum may be confused but these infants lack the other skeletal features. Introduction and general description More than 150 diseases manifest one or more features of apparent premature ageing, but there are discrepancies between this process and true ageing. Werner syndrome is characterized by multisystem involvement and an increased risk of malignancy [1,2]. Disease course and prognosis Death occurs at an average age of 13 years and most commonly results from myocardial infarction or stroke [1]. Management First line Infants and children may experience feeding difficulties and failure to thrive and require advice regarding nutrition. Early input from physiotherapy and occupational therapy should be arranged to help reduce the complications of arthritis Second line A clinical trial in children of a farnesyl transferase inhibitor, lonafarnib, improved weight gain, vascular stiffness, bone structure and audiological status [27]. Ethnicity Relatively higher incidence has been reported in Japan (approximately 75% of all cases) and northern Sardinia with founder mutations in these countries [6,7]. The dermis is thickened, with replacement of subcutaneous fat by hyalinized collagen, increased glycosaminoglycans, abnormal elastic fibres, disorganized nerves and vessel changes, which resemble those seen in diabetes. Investigations should be directed to assess the known complications especially diabetes, arteriosclerosis and hypogonadism. There may be calcification of the arteries, ligaments, tendons and subcutaneous tissues, with osteoporosis of the extremities, especially the legs. Osteosclerosis of the distal phalanges of the fingers and/or toes can also be detected on radiographs [17]. The management of recurrent painful ulceration of the feet and legs is difficult, and amputation may be needed. Cataract surgery should be undertaken with special caution, for it is often complicated by severe degenerative changes of the cornea [13]. The first significant changes are usually noticed between 18 and 30 years but may begin earlier. Cutaneous findings include, in addition to hair thinning and greying, loss of subcutaneous tissue and sclerodermalike changes with associated telangiectases, calcinosis and ulcerations. A high pitched or hoarse voice from thinning of the vocal cords and fixation of the epiglottis is characteristic. Hypogonadism and premature menopause are characteristic, with sparse or absent pubic and axillary hair. Diffuse early atherosclerosis results in ischaemic and valvular heart disease and is a major cause of premature death among patients. Synonyms and inclusions · Metageria · Acrometageria · Gottron syndrome Differential diagnosis this includes progeria, Rothmund­Thomson syndrome (see Chapter 77), systemic sclerosis (see Chapter 56) and Huriez syndrome (see Chapter 65). The differentiation from some of the other ageing syndromes is indicated in Table 72. Complications and comorbidities A recent study of neoplasias in 189 Werner syndrome patients [14] has identified that the most frequent tumours are thyroid carcinomas (16. Introduction and general description It remains unclear whether Gottron syndrome is a distinct or heterogeneous group of disorders. Epidemiology Incidence and prevalence Extremely rare with only about 40 cases described. Disease course and prognosis Death usually occurs in the fourth to sixth decade, due to myocardial infarction or malignancy [15]. The dermis is atrophic, with sparse thin collagen bundles, but there is abundant elastin, which appears clumped due to the deficiency of collagen [3,4]. Synonyms and inclusions · Craniomandibular dermatodysostosis Clinical features Epidemiology Presentation (see Table 72. The skin becomes dry, thin, transparent and wrinkled, especially over the hands and feet, although the trunk and face may be affected to a lesser extent. Age Affected individuals have a normal appearance at birth, then progressively develop lipodystrophy and dysmorphic craniofacial and skeletal features. Thirdly, cases are occasionally described which do not fit easily into any of the previously recognized categories and have been termed metageria and acrometageria [10,11]. Cellular senescence probably occurs via a variety of these molecular processes [5]. Differential diagnosis the lack of other system involvement helps to distinguish the condition from progeria and pangeria. Other characteristics may include short stature, multiple Wormian bones, prominent eyes and a sharp nose [6,7]. Some patients show progeroid features such as birdlike facies, highpitched voice and ectodermal defects, such as skin atrophy, mottled pigmentation, alopecia and nail dysplasia [8,9]. Sex Although both sexes should be affected equally, more male cases have been reported. Differential diagnosis the cutaneous changes resemble a mild form of progeria and some cases have been mistakenly diagnosed in the past as acrogeria or Werner syndrome. Normal development occurs until the age of around 2 years and may therefore be confused with mandibuloacral dysplasia. Pathology In one patient investigated, the skin fibroblasts were slow to grow in culture and they were morphologically different from normal controls in their size, with large number of inclusions and absence of primary cilia [2]. Complications and comorbidities Due to the association of the development of metabolic disorders, the risk of cardiovascular disease is likely to be increased. Disease course and prognosis the severity the clinical features increase with time although the true prognosis is unclear. Clinical features Investigations Molecular analysis and appropriate investigations targeted at possible metabolic associations. Presentation this rare progeroid syndrome is characterized by low birth weight, short stature and moderate mental retardation, associated with multiple pigmented naevi and a distinctive birdlike facies with microcephaly [2,3]. There is a small chin with a broad forehead, and the lack of facial subcutaneous fat gives an appearance of premature ageing. Other Management There is no specific therapy but treatment is aimed at reducing any metabolic complications. Differential diagnosis Cockayne syndrome patients exhibit similar facial features, short stature and mental retardation. Complications and comorbidities Four cases have developed cancers in their twenties involving the stomach, tongue, pancreas and skin (melanoma) [4­6]. Disease course and prognosis the clinical features tend to become more noticeable with increasing age. Adult manifestations include the development of tumours, a sleep disorder with severe insomnia (agrypnia excitata) and cognitive decline [4]. The facial features include frontal and lateral bossing of the skull with small facial bones, a small beakshaped nose, lowset ears, small mouth with dysodontia and ectropion. The scalp hair and eyebrows are long and sparse, the extremities are thin and the hands are large with long fingers and atrophic nails. The subcutaneous fat is decreased, the skin is thin and wrinkled and the veins are prominent. Differential diagnosis Wiedemann­Rautenstrauch syndrome should be differentiated from other syndromes that exhibit a progeroid phenotype at birth [2], for example, Petty­Laxova­Wiedemann syndrome [6] and Hallerman­Strieff syndrome [7]. The true progeria syndromes usually do not show the characteristics of premature ageing until sometime after birth. Synonyms and inclusions · Wiedemann­Rautenstrauch syndrome · Neonatal pseudohydrocephalic progeroid syndrome Disease course and prognosis It is usually lethal by the first year of life often due to respiratory tract infections. Epidemiology Incidence and prevalence Very rare with only about 30 cases reported [2]. Abnormal mineralization of peripheral tissues occurs and despite identification of the underlying molecular defect, the mechanisms leading to calcification are poorly understood. Pathology In the fully developed skin lesions, the elastic fibres in the mid dermis are clumped, degenerate, fragmented and swollen, and the abnormal fibres stain positively for calcium. Similar changes occur in the connective tissue of the media and intima of the blood vessels, the Bruch membrane of the eye, and in the endocardium and pericardium. The heart may occasionally be enlarged, with extensive calcification [14], and rarely pulmonary calcification has been reported [15]. Calcification may occur in other viscera including the placenta, liver, kidneys, testes, spleen and mammary tissue [16­18]. Epidemiology Incidence and prevalence the precise prevalence is unknown but it is thought to occur in about 1/50 000. This may in part reflect selfselection bias as it appears that women are more likely to have skin involvement [3]. Clinical features History the complete syndrome consists of asymptomatic flexural skin lesions, visual disturbances and cardiovascular manifestations due to calcification. Mutations in this gene affect transport of anionic peptides Skin changes the characteristic skin lesions consist of small (1­3 mm), yellowish papules in a linear or reticular pattern, which tend to coalesce into confluent plaques. The skin is soft, lax and slightly wrinkled, and may hang in folds, especially in elderly people. It rarely develops in early childhood, and usually does so in teenage years, but it may also first appear in old age. Similar changes may occur in the soft palate, inside the lips and in the mucous membranes of stomach, rectum and vagina. Occasionally, there may be spontaneous perforating lesions, with transepidermal elimination of the fragmented elastic fibres (sometimes assuming the typical appearance of elastosis serpiginosa perforans). Cardiovascular changes Arterial involvement does not usually clinically manifest until adult life. Involvement in early childhood raises the possibility of overlap with generalized arterial calcification of infancy [29].

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Introduction and general description There are few patients with acne who can resist squeezing skin lesions antibiotic used for kidney infection discount 200 mg vantin overnight delivery. Brocq described acné excoriée particularly in adolescent girls under emotional stress household antibiotics for dogs vantin 200 mg with amex, who picked and squeezed acne Part 7: Psychological virus 07092012 order vantin on line amex, sensory & neurological 86 does oral antibiotics for acne work cheapest generic vantin uk. Although some patients develop these lesions after picking acne antibiotic resistance and natural selection worksheet order vantin 200 mg without a prescription, most had no acne at all. Differential diagnosis Differential diagnoses include the facial picking disorder (where there are no acneform lesions originating the picking habit), trigeminal trophic syndrome (see Chapter 84) and dermatitis artefacta. They are found predominantly around the hairline, forehead, preauricular cheek and chin areas. Chronic lesions characteristically show white, atrophic scarring with peripheral hyperpigmentation. Familial predisposition is fairly common and successive generations of patients with trichotillosis have been described. It is always worth considering the (rarer) association with emotional or sexual abuse. Many subdivide patients into younger and older groups and those with dissociative symptoms [1]. Patients with an earlier onset with limited progression usually have a better prognosis. Recalcitrant, obsessive and focused hair pulling is usually found in older women, and patients may deny their hair pulling. Automatic hair pulling is also found, and some patients pull their hair in a dissociative or fugue state. The habit is often hidden from the partner/close family and the hair loss is usually covered up. Patients may describe a sense of control over their body/psychosocial situation that is briefly facilitated by their hair pulling habits. Some describe pulling hair in a fuguelike state and having no control over the episodes of hair pulling. Some patients select an apparently abnormal hair by feel or texture and extend it into an adjacent area. Most pull hair from the vertex, but temporal, occipital and frontal hair loss in children may be more obvious on the side of manual dominance. The hair loss may be minimal, commonly a solitary patch, but visible hair thinning may progress to virtual total depilation, significantly so in adult women. The hair pulling activity is usually not as a response to any skin symptoms but is either a conscious, deliberate act or more often a subconscious act, almost in some children being part of a hypnogogic (dreamlike) state. Some patients may have incomplete awareness until the pattern has been established. Twothirds of adults pulled hair from two or more sites and onethird from three areas. Body and pubic hair plucking, commoner in males, may become a ritualized activity done either alone or as a conjugal activity and can indicate a personality or psychotic disorder. Hair is plucked from the scalp on average two to three times per day and daily from other areas. The duration and frequency of activity is variable but adults in general have longer and more frequent activity. Adults have a more conscious, epidemiology Incidence and prevalence this is commoner in children and college students (rates of 0. Age There appear to be two distinct populations: those who present in childhood, mainly between the ages of 5 and 12 years, and more chronic cases who present as adults but who started hair pulling activities in adolescence or early adult life [2]. The number of affected children may be seven times that of adults and there is evidence of a bimodal distribution with peaks in the preschool years and in adolescence [3]. Preschool children are more likely to be boys (62%), although after this older boys and male adolescents make up only 30% of the group. This earlyonset group, usually aged between 2 and 10 years, show benign, selflimiting behaviour and most are probably suffering a habit disorder, perhaps as an extension of hair twirling activity and childhood stress. In adults there is greater psychopathology and a distinct female preponderance, usually 4: 1, but this is most evident in the oldest group (F: M 15: 1). The patterns of plucking activity are centrifugal from a single starting point or linear, in wavelike activity. In extreme cases, the centrifugal pattern removes all hair except the most difficult to access, namely that on the occiput. Patients use wigs, hair weaving, false eyelashes and semipermanent use of hats and scarves to disguise the defects. Chronic folliculitis of the neck, chin, chest, pubic areas or thighs as a result of plucking activity may also be the presenting complaint. Children may pluck the hair, or stroke or suck the hair root before chewing and swallowing the remainder. The hair root alone may be eaten (trichorhizophagia) as a secretive activity and in a few patients the whole hair is eaten (trichophagia). Patients who eat more hair tend to swallow the longer strands and a very small percentage develop gastrointestinal bezoars. Part 7: Psychological, sensory & neurological structured activity, initially seeking thicker or distorted hair and then progressing to larger areas, taking more and more time over the activity. This may become similar to a compulsion with elaboration of the rituals using instruments such as tweezers. The more frequent the plucking episodes, the greater the body image dissatisfaction and the more likely the patient will suffer depression and anxiety. This name is derived from the Arabic word badzahr, meaning an antidote or counterpoison (cf the Harry Potter stories). It also relates to the hardened contents of the fourth stomach of the Syrian goat, much prized as a cure for many diseases. It is rare but its importance is that morbidity is high with chronicity and severe complications, which can lead to death. Longer hair is more likely to become enmeshed into a ball by the action of peristalsis, and this then becomes too large to leave the stomach via the pylorus. Management these treatments are in addition to the general approach to management outlined at the beginning of this section. Although the condition is very rare, it should be considered in children with trichotillosis who present with a combination of any of the following: abdominal pain, weight loss, nausea, vomiting, anorexia and foul breath. This describes a trichobezoar with a tail that extends at least to the jejunum; sufferers are highly likely to have gastrointestinal obstructive symptoms. In a review of 27 cases, which included only one male, the mean age at presentation was 10. In this group 37% had abdominal pain, 33% nausea and vomiting, 26% obstruction and 18. The tail may also be broken up into numerous segments distributed throughout the small bowel. The aetiologies suggested include stress, imitation of family members and transference from the thumb sucking habit. Nail biting is usually confined to the fingernails, but nail picking, especially in adults, may involve all digits. Damage to cuticles and nails causes paronychia, nail dystrophy and longitudinal nail scarring [2]. Compulsive biting, tearing or picking with instruments such as scissors, knives or razorblades may lead to permanent destruction. Onychotillomania may be a feature of developmental problems in children and is a component of selfdestructive behaviours in the Tourette and Prader­Willi syndromes. In adults, chronic nail biting is most commonly an isolated, selfdestructive habit, which may respond to cognitive behavioural training [3]. Rarely, onychotillomania is a manifestation of a major depressive disorder that has a suicide risk. Selfinduced anonychia of the toenails was produced by one man who plucked out his nails with pliers rather than suffer recurrent paronychia from previously crushed toes. Scalp biopsy is rarely necessary unless clinicians need to distinguish trichotillosis from scarring alopecia. Trichoscopy/dermoscopy has been Part 7: Psychological, sensory & neurological figure 86. Mirtazepine is a sedating antidepressant that may be used if patients have sleeping disorders. Dermatology patients may present with focused anxieties about the development of a variety of cutaneous diseases. Predominant cutaneous anxieties (or phobias) can be divided into: 1 Anxieties of contamination, Dirt, infection and wart phobias [1] second and third line · Occasionally antipsychotics may be helpful if the patient presents with delusional disease · Mood stabilizers. Hand washing leading to dermatitis is common, but up to 10% will admit to compulsive body washing also. The precipitating factors are fears of dirt and contamination from others who have been infected with real organisms. Hand washing may occur up to 100 times per day and compulsive showering and bathing 10­20 times daily. Irritant dermatitis that does not resolve with adequate advice should prompt inquiry, not only about washing compulsions but also checking behaviours. For example, the patient may have had a malignant lesion removed and need constant reassurances. Or there may have been malignancy or death from melanoma in family or friends, or concern repeatedly triggered by media, medical or family pressure. Patients present regularly and acutely to a screening clinic or primary care physicians. They may demand removal of some or all of their moles or even attempt selfsurgery. Mole phobia by proxy is not uncommon in parents who worry about their children and their moles to such an extent that normal play activities and family holidays are curtailed because of concerns about sun exposure. Bulimia nervosa is defined by the following: 1 Recurrent and compulsive overeating episodes (binge eating). The incidence is 270 per 100 000 person years in this group of younger women compared to 8 per 100 000 person years in the group of women as a whole. Age, sex and race Anorexia occurs earlier in life, usually in adolescence, whilst bulimia has its peak in the later teens and early twenties. The majority of sufferers are young women; the proportion of men being 1: 20 though there is increasing evidence that this is moving closer to 1: 5. It is commoner in industrialized societies and much more frequent in those of high social class. Cutaneous comorbidities [3] There are a number of skin problems commonly found in sufferers of anorexia and bulimia: · Xerosis and pruritus. Investigations and management Dermatologists should suspect anorexia nervosa when presented with these suggestive signs, particularly in an underweight girl. A simple screening questionnaire is helpful for detecting eating disorders (Box 86. Patients not resistant to the suggestion of specialist care should be referred to a psychiatrist. Dermatologists may be able to help with advice about treatment of skin manifestations. Dermatological, neurological, iatrogenic illness and internal disease are wellrecognized causes [1] (see also Chapter 83). The propensity for individuals to sense itch after psychological provocation by pictures of insects, rashes and watching other subjects scratching demonstrates the ready ability of simple measures to induce psychosomatic pruritus. There are three compulsory criteria: 1 Localized or generalized pruritus sine material. Patterns of itching and scratching may predominantly occur during periods of relaxation or nonoccupied time. Pruritic episodes may be unpredictable in onset and present with abrupt and sudden termination. In some individuals, intense scratching can induce a feeling of pleasure which may be related to the release of opioids centrally. The physician makes these assumptions in assessing the combination of signs and symptoms of the illness. Patients may misattribute causation on the basis of experience, culture and a need to place the illness in a context. They may have mistaken beliefs because of advice from other medical or, increasingly, media or Internetinspired sources. Clinical deception refers to a spectrum of illness that lies in a continuum depending on the level of intention to deceive at the time of the act, and the motivation for the induced illness. B the individual presents himself or herself to others as ill, impaired or injured. C the deceptive behaviour is evident even in the absence of obvious external rewards. D the behaviour is not better explained by another mental disorder such as a delusional disorder or another psychotic disorder. Criterion A supposedly excludes disorders characterized by unintentional production of symptoms, thereby marking a distinction between factitious disorders and somatoform, conversion and dissociative disorders. Criterion B assumes an internal incentive which the patient may deny even to themselves, and criterion C excludes the intentional production of symptoms for external gain, thereby marking a distinction with malingering. The nomenclature for dermatological lesions produced by patients, as defined above, is multifarious. Artifice is a noun meaning the use of cunning plans or devices in order to trick or deceive whilst an artefact is defined as manmade and artistic or decorative. A fabrication is an invention often, in certain contexts, meaning with deceitful intent, whilst factitious is an adjective meaning artificial or contrived.

Congenital connective tissue naevi and fat naevi Definition and nomenclature Congenital connective tissue naevi are benign cutaneous hamarto mas of connective tissue components present at birth antibiotic resistant uti in dogs purchase vantin 200 mg with mastercard. Synonyms and inclusions · Collagen naevus · Familial cutaneous collagenoma · Elastic tissue naevus · Juvenile elastoma · Naevus anelasticans · Mucinous naevus · Mixed connective tissue naevus · Congenital lipoma · Naevus psiloliparus (a) Introduction and general description Congenital connective tissue naevi are a clinically heterogene ous group of hamartomas antimicrobial fabric purchase vantin 200 mg with visa, named by the predominant cell type on histology 7 bacteria buy vantin on line amex, and therefore usually requiring biopsy for accurate diagnosis bacteria for septic tanks order vantin pills in toronto. Epidemiology Incidence and prevalence Congenital connective tissue naevi as a group are rare at birth but exact prevalences have not been established antibiotic resistant tb discount vantin 100 mg buy. Pathophysiology Pathology Histologically, connective tissue naevi are hamartomatous lesions of the dermis usually with a mixed histological composition [1] but in which a predominant component is present, giving the lesion its name, or by the absence of a component as in naevus anelasticus. Lesions are poorly circumscribed and nonencap sulated and show thickening of the dermis with replacement of the normal dermis or subcutis with lesional tissue. They can be single or multiple, and can be associated with extracutaneous features. Some can continue to grow or develop adjacent new lesions, particularly plantar collagenomas in Proteus syndrome [2] and elastomas in Buschke­Ollendorff syndrome. Naevus psiloliparus is a rare entity characterized by aberrant hair follicle development and prominent dermal fat deposition [10], which presents as a smooth, skincoloured or yellowish, flat or slightly raised lesion on the scalp. These naevi can be single lesions with out associated abnormalities [11], or can be found in encephalo craniocutaneous lipomatosis. The genetic basis of single, nonsyndromic, non familial connective tissue naevi is not yet known. Suspected cases should have limited plain radiographs to look for the characteristic findings of osteopoikilo sis and melorheostosis. As this condition is progressive and the full phenotype evolves over time, suspected cases should be referred urgently for specialist investi gation of storage disorders. However, these lesions would not usually be present congenitally, and are not usually an isolated presenting feature of the disease. The principal importance of congenital lipomas in paediatric dermatology lies in the association of lumbosacral lesions and underlying spinal defects [16], which should be sought using appropriate imaging techniques. Congenital lipomas and naevus psiloliparus can also form part of the neurocutaneous disorder encephalocraniocutaneous lipomatosis, for which ophthalmo logical and neurological investigations are required if suspected. This is in contrast to eruptive collagenomas, an acquired disease of multiple lesions appearing after puberty. Familial cutaneous collagenomas again present later in life, and are usually multi ple, often larger lesions. Collagenomas associated with Proteus syndrome occur characteristically on the soles of the feet in the first few years of life, and are cerebriform in appearance. Congenital elastomas are firm, skincoloured or creamy/ yellowish papules or nodules, with a diameter ranging from millimetres to a centimetre, that often coalesce to form plaques or clusters. Single lesions can present at any site; however in Buschke­Ollendorff syndrome they classically present in groups or plaques on the lower abdominal wall, trunk, arms and but tocks. Naevus anelasticus is not described congenitally but does start in the first two decades. This is a histopathological diag nosis due to the absence or fragmentation of elastic fibres within a papule or plaque, and controversy exists regarding the diag nostic overlap between this and eruptive collagenomas or papu lar elastorrhexis [5­7]. Congenital lipomas present as localized, skincoloured, soft proliferations with indistinct edges. Management Family history, examination and followup for any associated non cutaneous or syndromic features are important. In the absence of these, single lesions can be followed up until deemed to be iso lated and stable. Becker naevus (or Becker melanosis) is a relatively common hyperpigmented, generally nonlinear lesion with an incidence of around 0. It is only rarely congenital, with the majority of lesions appearing in the first two decades, classically at puberty. It is frequently but not always hypertrichotic, and is commonest on the upper trunk. Becker naevus is not uncom monly associated with extracutaneous abnormalities [2], then termed Becker naevus syndrome [3], which can involve under lying structures, namely aplasia or hypoplasia of the underlying breast tissue, or pectoralis major muscle (or sometimes shoul der muscles) or lipoatrophy. Other extracutaneous associations described are ipsilateral limb growth disturbance, supernumer ary nipples [4] and scoliosis. The angora hair naevus [6] is an extremely rare hypertrichotic naevus with increased pigmentation in the basal layer, where the hypertrichosis has a hypopigmented and fine nature. This entity describes an acquired hyperpigmented atrophy of subcutaneous tissue rather than a nae vus, but in a Blaschkolinear distribution [7]. It generally appears in the first two decades of life, and usually stabilizes after its initial development, although very slow progression has been described [8]. No familial cases have been described thus far, and the genetic basis is still unknown although hypotheses have been suggested [10]. These can rarely occur either as single linear lesions, or as a linear com ponent of generalized disease. Where known autosomal dominant conditions have been described with a Blaschkolinear component, this has been proposed to be due to loss of heterozy gosity of the normal allele in the linear area [11]. This hypothesis has so far been proven for linear HaileyHailey disease [12] and linear Darier disease [13]. Blaschkolinear areas of conditions where the genetic basis is not fully understood such as atopic eczema, psoriasis, juvenile xanthogranuloma, granuloma annulare, lichen planus and pem phigus vulgaris are rarely described as a concomitant, antecedent or only manifestation of more typical disease [14]. Although hypotheses concerning pathogenesis have been evinced, there are thus far no data explaining this phenomenon. Most commonly (in approxi mately 85% of cases), this is a single isolated lesion near the ver tex of the scalp. At birth the lesions can either be healed with scarring, often with a thin parchmentlike appearance, or they can be open, with varying levels of ulceration. Prognosis for single superficial lesions is excellent, resulting in a cosmetic defect only. It can be seen with chromosomal abnormalities, in particular trisomy 13 (Patau syndrome) [4] or 4p16. Inheritance in affected families can be dominant or reces sive, depending on the gene and mutation. Striated muscle hamartoma is an uncommon congenital lesion, usually arising on the head or neck, with a particular propensity for the chin. Clinically it is usually soft and often polypoid, and histologically it shows benign striated muscle fibres within the dermis and/or subcutis, with or without hamartomatous collec tions of other cutaneous components [8]. These lesions can be iso lated or associated with extracutaneous abnormalities [9]. Congenital muscle hamartoma Smooth muscle hamartomas are benign collections of mature smooth muscle fibres within the dermis [1,2]. Clinically they are soft, skincoloured or slightly pinkbrown lesions with indis tinct edges, with overlying hair that may not be present at birth. Characteristically they demonstrate induration or wormlike fas ciculation when the lesion is rubbed (pseudoDarier sign), with raising of overlying hairs. The lesions are usually up to a few cen timetres in diameter and solitary, most commonly in the lumbo sacral region [2]. Once established they are static in behaviour, and heterotrimeric Gprotein mosaic disorders Heterotrimeric guanosine nucleotidebinding protein (Gprotein) mosaic disorders are a new grouping of previously distinct disor ders that have recently been identified to have a common genetic basis, namely mosaicism for Gprotein subunit mutations. Het erotrimeric Gproteins are key molecular switches that assemble from alpha, beta and gamma subunits to transduce signals from Gproteincoupled receptors on the cell surface to intracellular sig nalling pathways. There are currently three known conditions in this group, namely McCune­Albright syndrome, Sturge­Weber syndrome and phakomatosis pigmentovascularis. The clinical presentation in these conditions is highly variable from case to case due to vari ation in the percentage of mosaicism, and the particular tissues affected by the mutations. McCune­Albright syndrome the classic triad that is McCune­Albright syndrome is the asso ciation of caféaulait macules, polyostotic fibrous dysplasia and autonomously hyperfunctioning endocrinopathies [1]. The clini cal diagnosis can be made in the presence of two of these three features, and the genetic diagnosis can be made in the presence of one of these three with a detected mutation [2]. The caféaulait pigmentation in this condition has to be dif ferentiated from the innumerable other causes of caféaulait macules. Bony involvement can present with pathological fracture, visible deformity and bone or joint pain. The commonest endocrinological abnormality is gonadotrophin independent precocious puberty, which has earlier onset in girls than in affected boys [4]. A wide range of other endocrinopathies has been described, including growth hormone excess, hyper thyroidism, Cushing syndrome and hyperparathyroidism [5]. Investigation of endocrinological abnormalities should be under taken by a paediatric endocrinologist, and treatment instigated as appropriate. If the condition is suspected from dermatological findings alone, then plain radiographs of the skull, mandible, pelvis and long bones should be performed to look for polyostotic fibrous dysplasia. If fibrous dysplasia is suspected or confirmed, further investigation should be guided by recent expert guidelines, as there is a small but significant risk of osteosarcoma in McCune­Albright syndrome [6]. Skin biopsy has not been considered the best investigation due to low sensitivity, probably due to the very small percentage of mutated cells in a pigmented macular lesion. However, the mutation is present in a substantial percent age of blood samples from affected patients, particularly in those with more widespread disease [2], so blood is worth testing in the absence of easy access to other affected tissues. Furthermore, nextgeneration sequencing has greatly improved the sensitivity of mutation detection, now down to below 1% mosaicism [8]. Sturge­Weber syndrome the first description of what came to be known as Sturge­Weber syndrome was of the association of extensive facial and truncal portwine stains (capillary malformations), contralateral focal sei zures thought to be due to an ipsilateral abnormality on the sur face of the brain (later confirmed in other cases) and ipsilateral intraocular vascular malformations presenting with glaucoma [9]. The definition of what constitutes a diagnosis of Sturge­Weber syndrome has altered many times subsequently, now encom passing cases without skin features [10] and with contralateral as well as ipsilateral brain or eye abnormalities [11,12]. As portwine stains are common, but Sturge­Weber syndrome relatively rare (unconfirmed estimates of incidence are 1: 20 000 to 1: 50 000), many attempts have been made to predict oculo cerebral associations from the phenotype of the portwine stains. Historically it was surmised that the facial lesions followed the distribution of the branches of the trigeminal nerves, and that those in the ophthalmic division or on both sides of the face were more likely to be associated with Sturge­Weber syndrome [16,17]. Recently, however, a new classification of the distribution of facial portwine stains in this condition has been proposed, which has found a strong association between lesions affecting any part of the forehead (defined at the lower border by a line joining the outer canthus of the eye to the top of the ipsilateral ear helix and including the upper eyelid) and Sturge­Weber syn drome [18]. This forehead region encompasses parts of all three divisions of the trigeminal nerve, confirming that all three divi sions can be involved [19,20], and that the distribution of facial portwine stains in this condition does not seem to follow a neu rological pattern but that of the embryonic vasculature brought from the neural crest [18]. Glaucoma can be present from birth, and ophthalmol ogy referral should therefore be made urgently to reduce poten tial morbidity. However, there is now some supportive evidence for the prophy lactic use of oral therapy in infants with cerebral involvement to reduce the venous stasisinduced cerebral atrophy and calci fication [21,22], and ongoing debate regarding prophylactic anti convulsants in the presence of radiological abnormalities [13]. Recent suggested guidelines from a dermatological viewpoint suggest scanning within the first 3 months of life in the highrisk group only (with neurological referral where there are positive findings), and repeat scanning at a later stage if there is clinical suspicion but the first scan was clear [18]. The recent elucidation of the genetic basis of Sturge­Weber syn drome will be helpful in clarifying the phenotypic boundaries of this disorder. This pathogenesis echoes that of the exqui site genotype­phenotype sensitivities described in other types of birthmarks, with the association with extracutaneous features likely to be due to earlier timing of the mutation and/or other as yet unknown background genetic or environmental influences. Phakomatosis pigmentovascularis Phakomatosis pigmentovascularis is a descriptive term currently applied to a group of phenotypes that are unified by the coexist ence of different pigmentary and vascular cutaneous lesions. In the largest study thus far of phakoma tosis pigmentovascularis, this phenotype had a prevalence of 0. However, there is not only clear phenotypic evidence of other subtypes, but now genotypic evidence as well. In addition, not all pheno types described in the literature are classifiable, and recent gen etic advances will help with the recognition of the spectrum of this disease. There may be significant differences in the incidence of phakomatosis pigmentovascularis between ethnic groups, as most cases described thus far have been in nonwhite indi viduals, but there are still too few series described to draw defi nite conclusions in this regard. Two subclassifications have previously been proposed, which can be roughly equated as shown in Table 75. As this condition is rare, the following associations and manage ment suggestions are based on the existing literature, the pheno typic and genotypic promixity of this disease to the better studied Sturge­Weber syndrome, and erring on the side of caution until larger series of patients can be studied. The known associations of phakomatosis pigmentovascularis are: · Naevus anaemicus (described in all the types). Importantly, this may not be evident without dilatation and slitlamp examination, therefore an ophthalmology review should be arranged for all patients with this diagnosis [29]. This appears to be more related to the epis cleral vascular malformations than the pigmentary abnormality [30], and examination of the literature suggests that those at risk of glaucoma may be primarily those with cutaneous vascular lesions around the eye. Radiologically, these lesions are often indistinguishable from those seen in Sturge­Weber syndrome, which has led to the misunderstanding that the two diagnoses coexist, and has now been explained by the genetic prox imity and sometimes overlap in pathogenesis. Clinically, these lesions can be accompanied by macrocephaly, developmental delay and/or seizures. Potentially prophylactic medication can be given to try to reduce the effects of venous stasis and underlying cortical atrophy (see the section on Sturge­Weber syndrome). Regular ophthalmo logical screening should be undertaken to screen for this com plication, and the patient should be made aware to report any ocular symptoms promptly. This predisposition is explained by the genetic basis of the cases described thus far. The genetic basis of some of the types of phakomatosis pig mentovascularis has recently been established in a small number of cases. There is conservation of the same mutation in one individual in both pigmentary and vascu lar lesions, but no mutation generally detectable in the blood [34]. This confirms the hypothesis of lethal genes surviving by mosai cism [24], but further refutes the hypothesis of twinspotting as the mechanism in this and similar mosaic disorders where two types of lesion coexist [35]. Rather, the pathogenetic mechanism is likely to be a single mutation affecting a precursor cell which gives rise to both the pigmentary and vascular lesions during development. A1 Unified classification of congenital naevi by clinical, histopathological and genetic criteria. Proteus syndrome: diagnostic criteria, differential diagnosis, and patient evaluation.

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