Spencer Yost MD

• Professor, Department of Anesthesia and Perioperative Care, University of California, San Francisco
• Medical Director, UCSF-Mt

https://anesthesia.ucsf.edu/people/spencer-yost

Central lesions (those placed near the clitoris heart attack during sex buy vasodilan 20 mg lowest price, urethra pulse pressure and exercise purchase on line vasodilan, vagina blood pressure medication helps acne generic vasodilan 20 mg free shipping, fourchette and perianal area) have a bilateral lymphatic drainage blood pressure quick fix order vasodilan 20 mg with mastercard, and it is important in these cases that the inguinofemoral nodes on both sides are excised arteria ileocolica safe 20 mg vasodilan. Radiotherapy is used as an adjuvant in patients with positive nodes and in those with inoperable tumours. It is also sometimes used as a primary treatment, together with chemotherapy, in tumours of the anus and urethra, to reduce their size before surgery and to try to preserve sphincter function. Associated diseases Verrucous carcinomas can arise on a background of lichen sclerosus [1]. Pathophysiology Pathology the histological changes include epidermal acanthosis, with large bulbous rete ridges which compress and push down the underlying stroma. There is very little cellular atypia and the few, if any, mitoses are confined to the basal layers. The upper keratinocytes are often paler and there is a loss of the granular layer. The differentiation between primary and secondary disease is not always straightforward clinically and sometimes relies on immunohistological investigations (Table 112. Epidemiology Incidence and prevalence the true prevalence is unknown but it accounts for 1­2% of all vulval malignancies. Differential diagnosis Verrucous carcinomas are often misdiagnosed as squamous papillomas or condylomas because of the benign histological features. Clinical features History the lesions may be asymptomatic initially and patients may report a longstanding eruption. Radiotherapy is not used as it is associated with a worse prognosis, probably because it can induce anaplastic transformation [4]. The site of the lesions is important as disease involving the urethra and perianal skin is more likely to be associated with an underlying malignancy of the urinary or gastrointestinal tract, respectively. In contrast to Paget disease of the nipple, the association with malignancy is only about 30% [2]. Patients should be regularly monitored, and topical steroids can be used if there is troublesome pruritus. Recurrence rates of over 40% are reported after surgery, and even with Mohs micrographic surgery, the disease can recur in up to 27% and large margins are required [9,10]. Topical 5fluorouracil, bleomycin and oral retinoids have been used, with some success. Photodynamic therapy is reported to be of some benefit [11] but longterm results have not been evaluated. In secondary disease, the treatment is directed predominantly at the associated carcinoma. Other associated tumours reported include the cervix, endometrium and ovary [2,6]. Age these tumours generally occur in the elderly but can be seen in younger women. Disease course and prognosis Recurrence is common with all currently available treatment modalities. Clinical features Presentation Vulval basal cell carcinomas present as an eroded plaque, which may be pigmented. Patients should have a full clinical examination and cervical cytology and mammography should be up to date. Disease course and prognosis Inadequate excision accounts for a high recurrence rate and metastases to regional lymph nodes [3]. Patients with vulval basal cell carcinomas frequently develop basal cell carcinomas at other sites [4]. Sometimes in the very elderly, with extensive disease or recurrence after vulvectomy, this is not always an Management Adequate excision is vital and Mohs micrographic surgery is the treatment of choice [5]. The clinical features are similar to melanoma elsewhere but in one study of 219 patients, 27% were amelanotic [4]. Epidemiology Disease course and prognosis There is often a delay in diagnosis and a poorer prognosis for vulval and vaginal melanoma in particular. Incidence and prevalence Vulval melanoma accounts for about 2­10% of vulval malignancy. About 3% of all melanomas are found on the genital tract and the estimated annual incidence is about one per 1 million women. Management the primary management is wide, local excision, with input from a specialist multidisciplinary team. Clinical features History Vulval melanoma is often asymptomatic until it ulcerates, or becomes nodular. Pathophysiology Pathology Large histiocytic cells with coffee bean nuclei are seen. Langerhans cells stain positively with S100 and characteristic Birkbeck granules are seen on electron microscopy. Clinical features Presentation In infants, it may present as a resistant napkin eruption with yellowish and sometimes purpuric lesions. Vulval pain related to a specific disorder 1 Infection 2 Inflammatory 3 Neoplastic 4 Neurological B. A diagnosis of vulvodynia should be strictly reserved for those patients who have the symptoms of pain or in the absence of any visible abnormality or explanation that would account for their symptoms. If any active dermatosis or dermographism is found that could account for the symptoms then that condition is the diagnosis rather than vulvodynia. The two common types seen are vestibulodynia (localized provoked vulval pain) and generalized vulvodynia (generalized spontaneous vulval pain). It is also important to remember that a form of dysaesthetic vulvodynia probably more accurately labelled postinflammatory vulval hyperaesthesia is a frequent problem following inflammatory conditions of the vulva, particularly the vestibule. Differential diagnosis the differential diagnosis is wide as it can mimic dermatoses and malignancy. Management Small localized lesions can be excised but for more extensive disease this is impractical and radiotherapy, chemotherapy and thalidomide have been used [3]. Incidence and prevalence the exact prevalence is not known but 16% of women in one study reported vulval pain lasting more than 3 months [2]. Age Vestibulodynia occurs in young women, whereas the generalized form is more common in older postmenopausal women. Associated diseases There is frequently a history of other pain issues such as fibromyalgia, migraine and back pain. Pathophysiology the pathophysiology of vulvodynia is unknown but the existence of complex regional pain syndromes is now well recognized. Chronic pain syndromes are rarely caused by primary psychiatric disorders as originally thought, but are the result of peripheral and/or central neuronal sensitization. Management [6,7] First line Lidocaine 5% ointment can be applied regularly to the maximum points of tenderness. Second line Predisposing factors the majority of patients affected by vestibulodynia are psychologically normal but they do have higher anxiety and somatization scores [4]. Pathology There is now good evidence that inflammation is not a feature in vulvodynia [5]. Third line Referral to a pain clinic and expert psychosexual counselling is helpful. Vestibulectomy has been used for vestibulodynia but is only suitable for a small minority and there are few longterm results of efficacy. It is not advocated as a routine procedure and surgery is rarely used for other neuropathic pain problems. Clinical features History In vestibulodynia, the classic history is of pain with penetration at intercourse. Patients will sometimes relate the onset of symptoms to a particular event such as a severe episode of candidiasis or urinary tract infection. In the generalized form, the history is of constant pain with no obvious trigger factors. The pain may vary in intensity and patients may complain of shooting pain into the pelvis, thighs or anal area. International Society for the Study of Vulvovaginal Disease information sheets: issvd. In vestibulodynia, there will be touchprovoked tenderness over the vestibule when pressure is applied with a cottontipped swab (the touch test). In some patients, the pain is localized to the clitoris and this is then termed clitorodynia. Differential diagnosis Dermatoses, infections and malignancy can cause pain but the signs are evident. Dermographism, nymphohymenal tears and vestibular fissures can cause pain with intercourse and sometimes it is helpful to examine the patient soon after intercourse to assess these. Pudendal neuralgia can be confused with generalized vulvodynia but here the pain is alleviated by standing. As with any chronic pain problem, most patients show a steady but slow response to treatment and sometimes combination therapies are needed. Introduction and general description Nymphohymenal tears are a cause of dyspareunia and occur in nulliparous women on each intercourse. It involves a variety of procedures to remove parts of the female genitalia for nonmedical reasons [1]. Epidemiology Incidence and prevalence It may affect up to 140 million women worldwide. Clinical features Presentation There are four types of operation performed, which vary according to the country and culture: 1 Clitoridectomy: removal of the clitoris and/or the clitoral hood (Sunna circumcision). Clinical features History Postcoital bleeding and pain at the site of the tear are the main symptoms. Disease course and prognosis They heal rapidly within a few days but recur at the same site with each intercourse. There may be immediate damage to the urethra and vagina but the later complications are often only seen during delivery in those who have had infibulation. It is important to examine the patient after intercourse or the signs may be missed. Resources Management Excision of the fissure with resuturing usually resolves the problem. Further information Royal College of Obstetricians and Gynaecologists guidelines 2009. Vulval adenosis may follow severe erosive disease such as toxic epidermal necrolysis. Pathophysiology the pathogenesis is unknown but it is postulated that it develops from remnant tissue of paramesonephric origin. Predisposing factors Prolonged use of the oral contraceptive pill and trauma can predispose to adenosis. Upper vaginal disease is well recognized to occur after in utero exposure to diethyl stilboestrol taken during pregnancy. Clinical features Clinical features Presentation the lesions are erythematous and very friable. Complications and comorbidities Vaginal adenosis has been associated with vaginal adenocarcinoma [1]. Differential diagnosis the clinical features are indistinguishable from erosive lichen planus. This is sometimes difficult to differentiate histologically as there may be a lichenoid infiltrate present. Complications and comorbidities Vaginal involvement leads to the development of synechiae and complete stenosis, hence early recognition is vital [2]. The eruption is not reproduced by application or injection of glucagon and does not occur in other conditions where increased levels of glucagon are found such as diabetes and renal failure. Pathology Keratinocytes are vacuolated and pale; necrosis leads to intraepidermal clefting. Environmental factors Moisture, friction and trauma may precipitate fresh lesions. History the lesions are pruritic, and flaccid bullae occur which then rupture and crust over. Presentation the lesions occur on the vulva, perineum and perianal skin and extend onto the thighs and lower abdomen. Extensive eroded erythema with crusting and a desquamative, serpiginous edge, which spreads out centrifugally, gives rise to the characteristic annular lesions. Differential diagnosis the histological changes are similar to those seen in Darier disease or Hailey­Hailey disease, but there is no family history or evidence of these diseases at other sites. Differential diagnosis A similar clinical picture is seen with zinc and protein deficiency and there are now a number of reports of necrolytic migratory erythema occurring with liver diseases in the absence of a glucagonoma [2]. Management Laser treatment has been reported to be useful in those who are unresponsive to topical steroids or retinoids [8]. Disease course and prognosis the eruption may relapse and remit and postinflammatory hyperpigmentation can last for a few weeks. The eruption resolves rapidly after surgery or medical treatment of the glucagonoma. Inflammatory dermatoses of the vulva Lichen sclerosus 5 Kreuter A, Kryvosheyeva Y, Terras S et al. Association of autoimmune diseases with lichen sclerosus in 532 male and female patients. The underreporting of skin disease in association with squamous cell carcinoma of the vulva. Investigations A skin biopsy will show the features described, and further endocrinological and imaging investigations are required to confirm any associated glucagonoma. Introduction and general description this was first described in 1984 [1], and is characterized by the presence of multiple papules or, less frequently, a single papule or plaquelike lesion on genital skin [2­5]. Genital ulcers as initial manifestation of Epstein­Barr virus infection: two new cases and review of the literature.

Reports of spontaneous involution over time or conversion to more common types of melanocytic naevi have been reported [207] heart attack follow me proven vasodilan 20 mg. Also seen are locally distributed brownish dots and globules and white perpendicular lines in the centre of the lesion arteria capodanno 2013 bologna buy vasodilan 20 mg with visa. The commonest sites for Spitz naevi are the head and neck area (37%) blood pressure 34 year old male 20 mg vasodilan overnight delivery, particularly the face and cheek in children blood pressure normal unit discount 20 mg vasodilan with mastercard, and the lower extremities (28%) in young adults [177 hypertension questionnaires vasodilan 20 mg buy overnight delivery,208]. Atypical Spitz tumours tend to be larger, more asymmetrical or ulcerated with irregular pigmentation and border outline (Table 132. Differential diagnosis the differential diagnosis of Spitz naevi includes acquired, dysplastic and congenital variants of melanocytic naevi and melanoma. A number of nonmelanocytic entities should also be considered such as dermatofibroma, molluscum contagiosum, pyogenic granuloma, haemangioma, mastocytoma, juvenile and adult xanthogranuloma, angiofibroma, histiocytoma and granuloma. Clinical variants A more deeply pigmented variant of Spitz naevus, called the spindle cell naevus of Reed, and initially described in 1975 [209], occurs mainly in young females and is most commonly seen on the thighs. Rare accounts of multiple eruptive or disseminated Spitz naevi involving the entire cutaneous surface have been reported [210­ 212]. In agminated Spitz naevi, multiple Spitz naevi can also occur in a grouped fashion, resembling a speckled congenital naevus. Desmoplastic Spitz naevus is a rare subtype of the Spitz naevus encountered most commonly in adults [178]. These lesions are usually pink or red, firm, raised nodules with little or no clinically visible melanocytic pigmentation. A desmoplastic Spitz is often the presenting type of a recurrent Spitz naevus following incomplete removal [213,214]. Part 12: NeoPlasia Disease course and prognosis Even though the metastatic behaviour of atypical Spitz tumours is well established, their malignant potential is debated since they only rarely result in a fatal outcome [215,216]. The use of sentinel lymph node biopsy in atypical Spitz tumours has clarified the rate of lymph node positivity (average of 38%) [217­221]. Nearly all sentinel lymph node biopsy positive cases resulted in negative nodes after complete lymphadenectomy and very few led to death in the immediate followup period. Risk stratification schemes using pathological criteria have attempted to classify Spitz tumours based on their metastatic potential. One study identified abnormal mitoses, mitotic counts of over 2/mm2 and deep mitoses as suggestive of spitzoid melanoma [222]. Interobserver variations, even between expert pathologists, for spitzoid lesions are significant [171]. Investigations Upon dermoscopy, Spitz naevi can demonstrate a diversity of patterns [223]. Local excision of the lesion with a margin of 1­3 mm is usually sufficient to confirm the diagnosis [225]. Since local recurrences have been reported at a rate of 7­16% [226], often presenting with a more atypical histology and increased desmoplasia, incompletely removed tumours should be reexcised [176]. Due to the very low probability of melanoma in children with typical or classic Spitz naevi, some experts prefer clinical monitoring of these lesions rather than intervention, provided that a close clinical and dermoscopic followup is performed [227,228]. Exceptions include large (>1 cm), nodular, ulcerated or rapidly growing lesions [224]. The histological diagnosis of an atypical Spitz tumour should be approached more aggressively and treated with a wide margin resection following the guidelines of melanoma resection. The significance of sentinel lymph node biopsy positivity and how to further manage the presence of nodal disease is currently unknown [215]. Given the low fatality rate of atypical Spitz tumours, the limited evidence of a survival benefit from selective lymphadenectomy in sentinel lymph node biopsy positive cases, and the potential morbidity associated with lymphadenectomy, a more judicious casebycase use of sentinel lymph node biopsy is recommended before further evidence is available [229]. The most favoured hypothesis proposes that blue naevi originate from latent dermal dendritic melanocytes, which are remnants of the melanocyte migration from the neural crest to the epidermis during gestation. Naevus cells can extend into the lower dermis along appendages or in the perivascular and perineural areas. An admixture of melanophages with intracytoplasmic coarse melanin granules, is often seen. With the exception of combined blue naevi, in which a blue naevus coexists with a congenital, acquired or Spitz naevus, blue naevi have no junctional component. In common blue naevi there are nodules or fascicles of larger, oval to spindle naevomelanocytes with clear vacuolated, less pigmented cytoplasm. Cellular blue naevi with increased atypia and mitoses (3­4 mitoses/mm2) have been designated as atypical cellular blue naevi, a term used to denote a biological behaviour intermediate between cellular blue naevus and malignant blue naevus. Epithelioid blue naevus (or pigmented epithelioid melanocytoma) can occur sporadically or in association with the Carney complex. The histological features that distinguish it from common blue naevi include vesicular rather than hyperchromatic nuclei of the dendritic cells and the presence of pigmented, polygonal and ­ more characteristicly ­ large epithelioid cells. A deep penetrating naevus is characterized by loosely organized nests of pleomorphic, pigmented epithelioid cells that penetrate in an inverted wedge configuration deep into the dermis or subcutaneous fat [231]. Unlike the majority of blue naevi, the deep penetrating naevus does not harbour mutations in Gnaq and Gna11 proteins. Part 12: NeoPlasia Synonyms and inclusions · Blue naevus of Jadassohn­Tièche · Blue neuronaevus Epidemiology Incidence and prevalence Their estimated prevalence in white populations is 0. Age Blue naevi usually present during childhood, puberty or early adulthood, but can occur at all ages. The dendritic melanocytes are located between the collagen bundles of the reticular dermis. Round melanophages with heavily pigmented cytoplasm and coarse melanin intermingle with the melanocytes. The cellular component of blue naevus extends deep to the reticular dermis of the skin and often projects into the adjacent subcutaneous fat. Between the cellular nodules there are aggregates of heavily pigmented dendritic melanocytes. Large or giant lesions, ulceration or the development of subcutaneous nodules can also be observed but are rare events. Blue naevi can incidentally arise in the prostate, female genital tract, lymph nodes, conjunctiva, nasal and oral mucosa and lungs. Clinical variants A variety of clinical variants have been described, such as the large congenital blue naevus, large plaque blue naevus with subcutaneous cellular nodules, and agminate, eruptive and target blue naevi. Some of the histological variants of blue naevi may also present with distinct clinical features. The deep penetrating naevus is more commonly observed on the head and neck, presenting with a diffuse, irregular lateral margin. The histology of each is characteristic and can easily help separate the two entities. Satellite lesions of blue naevi resembling cutaneous metastases of melanoma have been reported [233]. Disease course and prognosis Blue naevi are generally nonprogressive proliferations. When in clinical doubt, an excisional biopsy should be performed to rule out melanoma. Age It occurs in older ages compared with blue naevi, usually developing during the fourth decade of life. Pathophysiology Pathology (a) Malignant blue naevi usually have the architectural features found in cellular blue naevi, with the addition of a malignant component. Abnormal mitotic figures, severe cytological atypia, foci of necrosis, vascular infiltration and destructive tumour invasion are histological findings that support the diagnosis of malignancy. Differential diagnosis Malignant blue naevi should be differentiated from blue naevi and the socalled atypical blue naevi. Disease course and prognosis the common belief that malignant blue naevi are more aggressive than other subtypes of melanomas was not confirmed in Malignant blue naevus Definition this descriptive term corresponds to malignant melanomas that arise within a blue naevus or resemble a blue naevus. Introduction and general description A malignant blue naevus is in fact a melanoma that arises in association with a blue naevus (usually a cellular blue naevus), or at the site of a previously excised blue naevus, or is a melanoma arising de novo but with histological features resembling a blue naevus [234]. In this study no difference in survival or in the risk of metastases was observed compared with matched controls [235]. Management Following excisional biopsy with a 2 mm margin and histological confirmation of malignancy, management should follow the established guidelines for melanoma (see Chapter 143). Epidemiology Incidence and prevalence the prevalence of atypical naevi varies considerably among different studies, ranging from 2% up to 50% [240]. Clinically atypical naevi Definition and nomenclature these are melanocytic naevi, 5 mm or larger in diameter, with a macular component, irregular and poorly defined borders, asymmetrical outline and variable pigmentation (see Table 132. Typically, they appear during childhood and they become more prominent in puberty. Atypical naevi occur in older ages at a lower rate, and should be cautiously examined to rule out melanoma. Associated diseases Clinically, atypical naevi have consistently been associated with melanoma risk in relevant studies. This risk seems to depend on the number of atypical naevi, as well as on the personal and family history of melanoma. Atypical naevi are also associated with a higher risk of multiple primary melanomas [244­248]. The term dysplastic naevus was also proposed during the same year by Greene et al. Ever since, the confusion and controversy caused by differences in terminology, definitions and criteria (clinical and histological) used has not ceased. Although they are benign lesions, they exhibit clinicopathological characteristics that may resemble early radial growth phase melanomas. They are also risk factors of melanoma and, to lesser extent, potential precursors of melanoma. In this way, they represent the intermediate part of the melanocytic neoplasm spectrum, with common (or banal) naevi at one end and melanoma at the other. Part 12: NeoPlasia Pathophysiology Predisposing factors Similar to common naevi, atypical naevi are also considered to be genetically determined, based on evidence from twin studies [250]. The role of environmental exposures is unknown although sunburn may be important [251]. The lower surgical scar on the sacral area corresponds to a previously removed superficial spreading melanoma. Diagnostic criteria for dysplastic naevi have been proposed by several groups [253­256] and are presented in Table 132. According to the World Health Organization, a histological diagnosis of dysplastic naevus requires the presence of both major and at least two minor criteria. The minor criteria include: (i) the presence of lamellar fibrosis or concentric eosinophilic fibrosis; (ii) neovascularization; (iii) an inflammatory response; and (iv) the fusion of rete ridges. The degree of mean concordance among the 10 members of the panel who examined 114 specimens of benign acquired naevi, dysplastic naevi and radial growth phase melanomas reached 92%. Although a clinically atypical naevus usually exhibits histological dysplasia, and vice versa, this is not always the case. Nests of melanocytes, of variable sizes and shapes, can be seen in the junctional area as well as lamellar fibrosis of the dermis beneath the rete ridges. Genetics At a molecular level, atypical naevi exhibit features that place them in an intermediate position on a spectrum ranging from common naevi to overt melanoma [258]. Although studies have not always been in accordance with each other, the most common molecular findings in atypical naevi include mutation/deletion of the p16 gene, altered expression of p53, increased microsatellite instability, alterations of pigmentation pathways, and mismatch repair gene expression [261­263]. Congenital melanocytic naevi and compound blue naevi sometimes can also exhibit atypical clinical features. Classification of severity Several studies have attempted to relate the grade of histological atypia (mild, moderate or severe) of these lesions to the risk of developing malignant melanoma [266]. Although patients with more severe histologically atypical naevi seem to have a higher risk of developing melanoma [242], the prognostic value of this classification is still limited due to a lack of uniform and objective criteria. Atypical naevi retain their ability to proliferate for an extended period before their maturation, resulting in a larger size and irregular shape and pigmentation compared with common naevi. Although the vast majority of naevi follow this course, there are some cases of both common and atypical naevi that evolve into radial growth phase melanomas. Histological examination of melanomas reveals that approximately onequarter develop on preexisting naevi. However, the rate of malignant transformation of naevi into melanomas is very low [90]. They sometimes present with a reddish hue that corresponds to a degree of inflammation. Differential diagnosis the critical distinction is between an atypical naevus and an in situ or early radial growth phase melanoma [265]. While the early detection of melanoma is of paramount importance in terms of prognosis, excessive prophylactic excision of benign naevi that are Clinically atypical naevi 132. Therefore, atypical naevi should mainly be viewed as risk markers ­ and occasionally simulants ­ for melanomas rather than true precursor lesions. Investigations Dermoscopy is always useful in assessing a melanocytic lesion with clinically atypical features. In in vivo confocal Management Since atypical naevi are risk markers rather than melanoma precursors, there is no need to excise for prophylactic reasons. The risk of melanoma conferred by the presence of atypical naevi remains even after their excision, since the majority of melanomas develop de novo. Patients with atypical naevi, especially those with high numbers of atypical and common naevi and/or a personal or family history of Key references 132. These patients should be taught to selfexamine their existing naevi as well as the rest of their skin for potentially suspicious lesions. Apart from a full skin examination, dermoscopy and photographic recording (either by digital dermoscopic imaging or by total body photography) should be used in patients with atypical naevi.

Purchase vasodilan amex. How To Quickly Lower Blood Pressure - How To Lower Blood Pressure Quickly.

The skin of the anal verge is pigmented and is puckered due to the contraction of fibres of the conjoint longitudinal layer high blood pressure medication and lemon juice order 20 mg vasodilan visa. Identification of the anal verge may be difficult heart attack back pain discount vasodilan american express, particularly in males in whom the perineum may funnel upwards towards the lower anal canal heart attack jack smack u blue vasodilan 20 mg line. The distinct border between the anal verge and perianal skin pulse pressure 53 quality 20 mg vasodilan, as identified by the appearance of hair follicles and keratinizing epithelium prehypertension in late pregnancy cheapest generic vasodilan uk, is called the anal margin. Cystic dilatation of the glands may extend through the internal sphincter and further into the external sphincter. Infection of the anal glands is the main cause of anal sepsis, including anal abscesses. The upper portion of the anal canal is lined by columnar epithelium similar to that of the rectum and contains secretory and absorptive cells. The columnar epithelium in the mid anal canal is thrown into 6­10 vertical folds, the anal columns. The columns are expanded in three areas in the anal canal to form the anal cushions. The lower end of the columns form semilunar folds, called the anal valves, between which lie small recesses referred to as anal sinuses. The dentate line represents an important landmark because the blood supply and innervation of the anal canal transition at this point. Proximal to the dentate line, the anus is innervated by parasympathetic and sympathetic nerves with an absence of pain fibres. Distal to the dentate line, the anal canal has numerous somatic nerve endings derived from the inferior rectal nerve and is sensitive to pain, temperature, touch and pressure. The columnar epithelial cells of the upper anal canal transition to nonkeratinized squamous epithelial cells approximately 1­1. Mucosa below the dentate line lacks sweat and sebaceous glands and hair follicles. It extends to the intersphincteric groove, a depression at the lower border of the internal sphincter. The canal below the intersphincteric groove is lined by hairbearing, keratinizing, stratified epithelium that is continuous with perianal skin. The smooth muscle of the internal anal sphincter is innervated by sympathetic and parasympathetic nerves and is in a state of tonic contraction. The striated muscle of the external anal sphincter is innervated by the inferior rectal nerve. The external anal sphincter is also in a state of tonic contraction, but has a component of voluntary control. The anal canal remains closed at rest as a result of tonic circumferential contraction of the sphincters and the presence of the anal cushions. The ischioanal fossa is a wedgeshaped space on each side of the anal canal filled with loose adipose tissue. Infections, tumours and fluid collections may spread relatively freely within the ischioanal space to the side of the anal canal and across the midline to the opposite side. Lymphatic drainage above the dentate line is to the mesorectal, lateral pelvic and inferior mesenteric nodes. Lymphatic spread of malignant disease from the lower half of the anal canal is to the inguinal lymph nodes. The deep natal cleft (gluteal cleft), the inguinal (crural) folds and the infragluteal folds are intertriginous sites because they are areas where two layers of skin come into close apposition. The natal cleft is deep and firmly fixed to the underlying fibrous and fascial tissues, and its sides are steep and closely apposed. Embryogenesis of the anogenital region In the early embryo, the blind ending diverticulum called the allantois and the hindgut open into a common cavity called the cloaca [3]. The levator ani muscle complex is composed of the ischiococcygeus, iliococcygeus and pubococcygeus muscles. The levator ani forms a large part of the pelvic floor, dividing the abdominal cavity from the perineum. It is brought about by the separation of the cloacal portion of the hindgut by the urorectal septum growing caudally between the allantois anteriorly and the hindgut posteriorly to fuse with the cloacal membrane. The area of fusion becomes the perineal body and separates the dorsal anal membrane from the larger ventral urogenital membrane. The mucosa of the upper half of the anal canal is derived from hindgut endoderm and is lined by columnar epithelium, it is innervated by autonomic nerves and the lymphatics and veins drain towards the portal system in the abdomen. The lower half of the anal canal is derived from ectoderm, is lined by stratified squamous epithelium, has a somatic nerve supply and venous drainage is towards the external iliac system while the lymphatics drain to the inguinal lymph nodes. Congenital and developmental abnormalities Complete or partial failure of the anal membrane to resorb during embryogenesis can result in anal stenosis. Other congenital abnormalities resulting from defective embryogenesis of the cloacal region include imperforate anus, anal agenesis, anal duplication, perineal groove and perineal fistulae. Congenital hypertrichosis over the midline in the lumbosacral area (the faun tail) is a sign of underlying spinal dysraphism. Other skin lesions presenting in the sacral region that can be associated with spinal dysraphism include congenital melanocytic naevi and hamartomas. Large perineal infantile haemangiomas may be associated with structural abnormalities including lipomyelomeningocele and imperforate anus [4]. Chordomas arise from the embryonic precursor of the axial skeleton, the notochord. They can involve the skin of the perineum, sacral area and buttocks by direct extension, recurrence or metastasis [5]. Persistent sacrococcygeal pain including coccygodynia may precede the diagnosis by many years. Inflammatory linear verrucous epidermal naevi can affect the ano genital region [7]. Hereditary mucoepithelial dysplasia is associated with perineal intertriginous plaques [8]. Pruritus ani can be primary (idiopathic) or secondary and is not a diagnosis unless qualified as constitutional or idiopathic. Management requires detailed assessment to determine whether there is an underlying cause. Pruritus ani can be associated with most forms of anorectal disease or perianal skin disease. Pruritus ani is considered idiopathic when no dermatological or anorectal cause can be found. Idiopathic pruritus ani is responsible for 50­90% of all cases of pruritus ani [1]. The pathogenesis of idiopathic pruritus ani is thought to be primarily the consequence of faecal contamination or possibly the intake of certain food or drinks. The common factor linking most cases of idiopathic pruritus ani is faecal contamination. These will cause faecal soiling and an increase in perianal trauma from frequent wiping of the skin. The role of food and drinks is uncertain but those implicated include coffee, tea, cola, beer, chocolate, tomatoes, spices and citrus fruits. The mechanisms proposed include effects on anal sphincter tone, production of loose stools and undigested food components irritating or sensitizing the perianal skin. Patients are often tense individuals in whom everyday problems induce a profound colonic reflex, resulting in defecation and soiling. Clinical features History the complaint is of itching, stinging or soreness that may be chronic and recurrent. Symptoms may be triggered by a bowel movement or wiping with toilet paper, but may occur at night. Differential diagnosis Fungal infection often causes intense pruritus, and diabetes must be excluded in all severe or persistent candidal infection. Complications and comorbidities Lichenification, excoriation and secondary infection can occur. Patients with idiopathic pruritus ani have a high incidence of loose stools and are rarely constipated. Any factor that increases faecal contamination exposes perianal skin to irritants. Causes of faecal contamination include the following (more than one factor may be operative): 1 Difficulty cleaning the perianal area: · Obesity leads to poor ventilation and maceration. Exaggerated rectoanal inhibitory refex and anal sphincter dysfunction may result in faecal soiling. Common allergens include neomycin, fragrance mix, Balsum of Peru [3] and methylisothiazolinone [4]. Chronic pruritus ani can lead to disruption in quality of life, irritability and depression [5]. Specific inflammatory dermatoses that commonly affect the perineum and perianal region are briefly described. The reader is referred to detailed description of specific diseases in relevant chapters. In adults, inflammation may result from the coexistence of several factors such as haemorrhoids, anal discharge and the effects of scratching. In all cases of perianal and perineal inflammation, the urine should be tested for glucose and swabs and scrapings tested for organisms. Inflammatory skin conditions can cause diagnostic difficulties as clinical features may be altered by the perianal microenvironment. Disease course and prognosis Generic measures usually improve symptoms in 90% of patients [2]. Many patients who undergo surgery for potentially implicated causes such as haemorrhoids continue to have symptoms. Investigations In the young, threadworms should be sought with the Sellotape test or by stool examination. It is important to maintain cleanliness and to ensure that the perianal area is dried after washing. A barrier preparation can be preapplied to the perianal skin before the bowels are opened. Topical anaesthetic preparations should be avoided as sensitization commonly occurs. A reduction of coffee consumption or elimination of food or drinks implicated may help. A highfibre diet should be encouraged if there is any history of constipation or haemorrhoids. Referral to a colorectal specialist is indicated if anorectal disease is suspected. Use of a twice daily liquid cleanser can be as effective as twice daily potent topical steroid application [6]. Mild steroid ointments (1% hydrocortisone) can be helpful [7] and these can be combined with antibacterials or antifungals. Caution should be exercised with topical steroids because perianal skin is occluded and atrophy may occur. Third line Successful treatment of refractory pruritus ani with intradermal injection of 1­2% methylene blue alone or in combination with 0. This simulates psoriasis but is usually unilateral, except when it involves the perianal area. It may occur as a small, intensely irritable area, localized to the edge of the anus. This should be suspected particularly if there has been prior use of topical corticosteroids. Allergic contact dermatitis is markedly inflamed and may have an ill-defined spreading border. Patients with chronic perianal dermatoses are at a higher risk of developing sensitization to topical medicaments than patients with genital dermatoses [1]. Common contact allergens in the anogenital region include neomycin, fragrance and Balsam of Peru. Methylisothiazolinone currently present in wet wipes is a common cause of allergy in patients presenting with perineal eczema [2]. Perineal dermatitis can commonly arise as a result of contact with urine or faeces. Danthron erythema is a form of irritant contact dermatitis caused by the use of laxatives containing danthron. Perianal lichen sclerosus occurs in 30% of women with genital lichen sclerosus and its occurrence has been associated with urinary incontinence. This pattern reflects the areas of anogenital skin that come into contact with urine. Men rarely if ever have perianal lichen sclerosus, probably because the male perineum is rarely exposed to urine [3]. The development of perineal lichen sclerosus on previously healthy perineal skin has been described in men following perineal urethrostomy for anterior urethral stricture (4). It is possible that chronic occluded contact of urine with susceptible epithelium is involved in the pathogenesis of anogenital lichen sclerosus. The barrier function of wet skin is diminished and it is more permeable to irritants. In addition, wet skin has an increased frictional coefficient and higher microbial content (5). Lichen planus affecting the perianal region is typically very pruritic and may become excoriated or hypertrophic.

Pubic hair appears in puberty as vellus hair that is focally replaced by terminal hair blood pressure medication video purchase online vasodilan. The pattern of pubic hair in men is different from that in women hypertension kidney group 08755 buy vasodilan with american express, and its distribution varies widely between men arrhythmia quotes order discount vasodilan online. Generally blood pressure medication names starting with p order discount vasodilan, the abdominal wall blood pressure medication start with l purchase 20 mg vasodilan with mastercard, pubic mound, groins, scrotum and perineum are hairy but the natal cleft, perianal skin, distal penile shaft, prepuce and glans are hairless. The pattern of keratinization of the epithelium is different throughout the anogenital area, particularly at the mucosal junctions, the prepuce and distal penile shaft and the glans in the circumcised male. The spectrum of differentiation of the male urogenital tract is manifest in the expression of differing epithelial cytokeratins [4]. Normal variants Normal male genital variants include pigmentary variation, hair variation (as discussed earlier), skin tags, pearly penile papules, sebaceous prominence, melanocytic naevi, prominent veins, angi omas and angiokeratomas, common congenital abnormalities and circumcision. Larger, fleshier, more oedematous skin tags should arouse the suspicion of Crohn dis ease. They are frequently mistaken for warts and misdi agnosed as Tyson glands or ectopic sebaceous glands of Fordyce. The lesion is analogous to other acral angiofibromas such as adenoma sebaceum, subungual and periungual fibromas, fibrous papule of the nose, acquired acral angiofibroma and oral fibroma [5]. Reassurance is usually sufficient but cryotherapy and laser treatment can be effective [6,7]. Sebaceous gland prominence, Tyson glands, sebaceous hyper plasia and ectopic sebaceous glands of Fordyce are all virtually synonymous, common, normal variants of the skin of the scrotal sac and penile shaft, but they may cause concern to the patient 111. It is possible that naevi on the penis occur more frequently in patients with the atypical naevus syndrome, but this has not been formally documented. A man who developed multiple blue naevi on the glans penis has been described [14]. Prominent veins are common, if not universal, and occasionally give rise to concern. Vascular white spots are sometimes seen on the glans, and are possibly analogous to Bier spots seen on the palms and forearms. They are usually multiple, blue to purple, smooth, 2­5 mm pap ules on the scrotum; angiokeratomas occur rarely on the penile shaft [20] and glans [10,21]. The role of local venous hypertension Part 10: sites, sex, age in the causation of these lesions is controversial [22]. The differen tial diagnosis includes angiokeratoma corporis diffusum, acquired capillary and cavernous haemangiomas, Masson tumour, glomus tumour, epithelioid haemangioma, bacillary angiomatosis, Kaposi sarcoma and epithelioid haemangioendothelioma. One case of florid genital angiokeratomatosis has been associated, perhaps coincidentally, with corporeal papular xanthomatosis [23]. Hyfre cation, electrocautery or laser ablation [24] can be offered, but lesions recur. Most patients are content with reassurance, and a biopsy is not usually necessary. Four per cent of boys have a retractable foreskin at birth, 15% at 6 months, 50% at 1 year and 80­90% at 3 years; the process should be complete by 17 years [5]. Circumcision Circumcision has been performed for religious, cultural or medi cal reasons throughout history [1] and a variety of techniques or alternative surgical procedures are now employed [2,3]. World wide, it has been estimated that approximately 25% of men have been circumcised [4]. The debate still rages although some policy makers now endorse the procedure for derived health benefits [10]. The effects of circumcision on male sexual function and sen sitivity are also disputed [11,12]. During infancy, circumcised boys have a higher incidence of penile problems than the uncircumcised, but after infancy the situation is significantly reversed [13,14]. Circumcision reduces the retrieval of pathogenic microorganisms from the penis [15,16]. However, the inci dence of penis cancer is low in countries where circumcision is uncommon [21], so other factors are important in penile carcino genesis. Circumcision protects men from inflammatory genital dermatoses including psoriasis, seborrhoeic dermatitis, lichen planus and lichen sclerosus [23]. This fact may be related to the occlusion and moisture consequent on the presence of the prepuce. Circumcision is important in the management of disorders of the penis and the foreskin, including dermatological disease. However, variability exists between clinicians in the indications for circumcision, especially in children. They include true phimo sis, recurrent balanoposthitis, lichen sclerosus, penile lymphoe dema, intraepithelial neoplasia and carcinoma. The consensus is that circumcision has insignificant adverse effects on health, but it is not risk free or complication free: bleed ing, infection, necrosis, adhesions, bridges, fistula, keloid, con cealed or buried penis, amputation, necrosis, excessive excision of penile skin, meatal stenosis, meatitis and meatal ulcer, cysts, chordee, hypospadias and epispadias, amputation neuromas, abnormal sexual behaviour, psychological distress and dysmor phophobia [25­36]. Other common abnormalities include meatal pit, sacral pit, hypospadias, median raphe cysts, canals and sinuses, and ambiguous genitalia [1,2,3]. Rarer anomalies include hypospadias variants, epispadias, penile hypoplasia, mucoid or urethral cysts, dermoid cyst, juve nile xanthogranuloma, buried penis, urethral atresia, penoscrotal transposition, congenital lymphoedema, lymphangiectasia, lym phangioma, giant preputial sac, megaprepuce, accessory scro tum, haemangiomas, strawberry naevus, white sponge naevus, os penis, true aposthia and faun tail [2,4,5,6]. Introduction and general description this is a rarely encountered phenomenon in male genital derma tology clinics. Pain, swell ing and deformity associated with the history of a cracking noise during strenuous or contorted intercourse characterize the diag nosis. Splitting of the tunica albuginea of the corpus cavernosum can result in urethral damage, haematoma and retention. Congenital and developmental abnormalities Congenital and developmental anomalies are common, reflecting the complicated embryogenesis and subsequent sexual differen tiation of the anogenital region. The lesion usually arises after prolonged or frequent sexual intercourse with a passive or unenthusiastic partner; sub sequent sexual activity may result in tenderness and enlargement. True phlebitis of penile and scrotal veins has been reported in three patients, of whom one had been injured by a golf ball, but the other cases were idiopathic [6]. Its occur rence after taking tadalafil for erectile dysfunction has been used to argue for an anatomical variation in the distal draining subcoro nal venous emissary arcade [7]. Thrombophlebitis of superficial penile and scrotal veins is analogous to Mondor phlebitis of the chest wall, but it may be associated with polyarteritis nodosa and thromboangiitis obliterans [8]. Penile thrombophlebitis has been misdiagnosed as Peyronie disease, and has also been the initial manifestation of a paraneoplastic migratory thrombophlebitis resulting from pancreatic cancer [9]. Given the circumstances that usually create the problem patients should be screened for under lying sexually transmitted infection, despite the appellation [10]. If oil, petroleum jelly or silicone is used then a paraffinoma, sili cone granuloma or (sclerosing) lipogranuloma can result. Lipogranuloma Patients may take it upon themselves to inject various substances with the aim of maintaining erection or enlarging the penis. Mineral oil, petroleum jelly and silicone introduced into the genital skin can elicit lipogranuloma or paraffinoma. Most cases are selfinduced, either to increase penile size or enhance sexual pleasure, but some may be accidental [26,27]. One patient injected his penis with an industrial highpressure pneumatic grease gun [28]. Idiopathic cases attributed to endogenous fat liberation have been reported, predominantly from Japan [29]. Dermatitis artefacta and mutilation Dermatitis artefacta of the genitalia does occur. Sometimes they are induced by needles, knives or cigarette burns, and extraneous for eign material may be introduced into the skin (lipogranuloma and silicone granuloma are discussed earlier). Psychotic patients may mutilate their genitalia, as may transves tites [30], but nonpsychotic genital selfmutilation can also occur. Australian aborigines create a slit in the penis by opening the ure thra ventrally, thereby creating hypospadias; this is called subinci sion [31,32,33]. It is important also to consider pyoderma gangrenosum, which is rare but frequently omitted from the dif ferential diagnosis of penile ulceration by nondermatologists. Strangulation of the penis the penis may be strangulated by ring devices [11,12], includ ing vacuum erection equipment [13], condom rings [14], rubber bands, string, rings (washers), nuts, bushes and sprockets, which are placed deliberately on the penis by the patient for masturba tion or to prolong erection [15,16]. In boys, strangulation can occur following experimental use of rubber bands, string or thread to control enuresis, or can result from encoiled hair after circumci sion [17]. Penile strangulation ­ the tourniquet syndrome ­ causes pain, swelling, urethral fistula, pseudoainhum, gangrene, amputa tion and even death [18]. Part 10: sites, sex, age Child abuse Physical and sexual child abuse should be considered in the dif ferential diagnosis of cutaneous disease of the anogenital area in children (Box 111. Foreign body Selfinstrumentation of the external genitalia may have an autoerotic, psychiatric, therapeutic (relief of itch [19], aiding voiding, cleaning) or accidental aetiology [20]. Complications include frequency, haematu ria, abscess, retention, fistulae and calculi. Endoscopic removal is usually possible for foreign bodies below the urogenital diaphragm. Glass beads, spheres of plastic or small round smooth stones (even pearls) may be introduced under the skin of the penis for erotic reasons, causing clinical and radiographical confusion. Extrusion of a testicular prosthesis has been reported as a cause of scrotal ulceration [24]. Clinical features Presentation Anogenital presentations of psoriasis may be vague in symptoma tology and nonspecific on examination. It is not usually itchy; sig nificant itch should arouse suspicions of another dermatosis such as an eczematous dermatitis or tinea. Genital appearances may be challenging to interpret, especially in the uncircumcised patient, because a mucosal site is affected rather than keratinized skin. The diagnosis is usually easier in the circumcised male where the morphology is similar to extragenital lesions. Inverse pattern psoriasis refers to the manifestation of the dis ease on intertriginous skin in the axillae, natal cleft, gluteal folds, groins and in the preputial sac and on the glans of the uncircum cised male, where its occurrence is probably brought about by the Koebner phenomenon. The significance of anogenital warts in suggesting possible child sexual abuse is controversial. Other traumatic and artefactual conditions Sometimes the penis is bitten by another individual or an animal [41]. Posttraumatic neuromas may be encountered and be mistaken for genital warts or pearly penile papules [42]. Degloving injuries can occur in acci dents with industrial or agricultural equipment [43]. Localized gangrene of the scrotum and penis resulting from arte rial embolization with particulate matter complicating accidental femoral selfinjection of heroin in an addict has been reported [47]. Differential diagnosis Eczema, fixed drug eruption, lichen planus, carcinoma in situ, extramammary Paget disease. Investigations Usually, the diagnosis of psoriasis is clinical, but a biopsy may be necessary. Carcinoma in situ and extramammary Paget disease may be misdiagnosed as psoriasis when there are single or several foci on the penile shaft and/or in the groins. Reactive arthritis (part of the same continuum as psoriasis in genetically predisposed individuals) is discussed elsewhere. Characteristic, sometimes severe, involvement of the penis (circinate balanitis) occurs. Strong crude tar preparations should be avoided at this site given that anogenital skin has a propensity to increased absorption of topical agents and because of the risk of genital can cer; one of the first occupational diseases described was scrotal carcinoma in chimney sweeps. Topi cal ciclosporin (100 mg/mL in wet dressings three times daily) has been advocated [1]. Topical calcineurin inhibitors may be helpful [2,3,4] and appear to be well tolerated but should be used with circumspection in the uncircumcised because of the squamous cancer risk. Phototherapy is contraindicated because of the risk of Part 10: sites, sex, age 111. It has several clini cal manifestations and causes, and may present with male genital involvement in isolation. Clinical variants and presentation Eczematous dermatoses Itching and lichenification, particularly around the scrotum, are common presenting problems. Contributory factors include pre existing dermatoses such as xerosis, atopy and psoriasis, sedentary occupations, motor car and aeroplane travel, and tight undercloth ing and trousers. Irritation is a key adverse exogenous influence to which ano genital sites are vulnerable, and sweat, sebum, desquamated corneocytes, dirt, excreta, sexual secretions, clothing, detergents, toiletries, cosmetics, contraceptives and some therapeutic topical treatments are all potential irritants. Frequently underrated are the effects of overwashing and the excessive use of soap and toiletries, especially in the presence of skin symptoms or urinary or bowel problems, and particularly if patients feel that they might have been exposed to a sexually transmitted disease. The skin may be broken by excoriations and become secondarily impetiginized or colonized by Candida. Irritant contact dermatitis Anogenital irritants are discussed earlier and listed in Box 111. Friction [2], maceration, overwashing, and concomitant anorec tal or urological disease are the chief influences. Topical 5fluorouracil used to treat keratoses at extragenital sites has caused genital irritant dermatitis [5]. Acute or chronic, sterile or superinfected (with staphylococci or Candida, or both), eroded or hyperkeratotic presentations are seen, depending on the scenario. Lichen simplex Part 10: sites, sex, age Lichen simplex is common around the male genitalia. Giant forms (of Pautrier) occur, giving a Allergic contact dermatitis the risks of allergic contact dermatitis of the genital skin come about from: (i) direct contact with the allergen. Eczematous symptomatology can appear approximately 1 week after first contact with the allergen if previously unsensitized, or within a few hours if already allergic. More immediate symptoma tology and acute erythema and angiooedema suggest a contact urticaria, which can occur with some of the rubber constituents of condoms and gloves [4,5,11,12,13,14].

References

• Ghali JK, Farah JO, Daifallah S, et al. Conivaptan and its role in the treatment of hyponatremia. Drug Des Dev Ther 2009;3:253-268.
• Clinical and Laboratory Standards Institute: Procedures for the collection of diagnostic blood specimens by venipuncture: approved standard, ed 5, Wayne, Pa, 2003, H3-A5.
• Ozgen A, Cila A: Riedelis thyroiditis in multifocal fibrosclerosis: CT and MR imaging findings, AJNR Am J Neuroradiol 21:320, 2000.
• Kjaergaard J, Petersen CL, Kjaer A, et al: Evaluation of right ventricular volume and function by 2D and 3D echocardiography compared to MRI. Eur J Echocardiogr 2006;7:430-438.
• Hosseini, M.M., Basiri, A., Moghaddam, S.M. Percutaneous nephrolithotomy of patients with staghorn stone and incidental purulent fluid suggestive of infection. J Endourol 2007;21:1429-1432.