Rectal cancer on skin

Background 1.

Incidence Anal canal cancer is a relatively rare tumor, representing approximately 1. It is approximately 20 to 30 times rarer than colon cancer, but its annual incidence is increasing, reaching up to cases, with a female predominance 2.

There is an important geographic variation regarding its incidence, as well as histopathological type. The mainstay of the treatment is represented by chemo-radiotherapy, radical surgery being reserved to residual tumor or recurrences.

Microsatellite instability (MSI)

Table 1; AJCC staging for anal cancer rectal cancer on skin. Histopathology Depending on the lining epithelium, anal canal is divided into three regions: colorectal zone: located proximally and containg columnar epithelium; transitional zone: spread over a distance that varies between 0 and 12 mm that contains a pseudostratified type of epithelium resembling the urothelial one.

A transformation zone is unanimously accepted in uterine cancer. This region of metaplasia is extremely susceptible to HPV action 4 ; squamous zone: contains a non-keratinized epithelium, without hair follicles. Rectal cancer on skin, lymphomas and small cell carcinomas similar in terms of evolution and prognosis to lung small cell carcinomasundifferentiated carcinoma or anal Rectal cancer on skin - only 17 cases described in literature up to 7 - have also been reported.

Concerning anal margin neoplasia, these are represented by: Bowen disease in situ squamous-cell carcinoma ; invasive squamous-cell carcinoma; Paget disease; basal cell carcinoma: an extremely rare tumor, approximately 20 cases rectal cancer on skin been reported joalis paraziti 20 years 28that is of good prognostic.

Было захватывающе интересно вглядываться в прошлое и видеть мир, который существовал еще в те времена, когда человек путешествовал среди звезд. Он указал на низкое круглое здание, стоящее в самом сердце города: Давайте начнем отсюда. Это место ничуть не хуже всякого другого для того, чтобы приступить к поиску. Быть может, это оказалось результатом чистой удачи.

The treatment consists in ample local resection or rectal amputation in case of sphincter invasion. TNM staging Anal cancer staging is based on tumor dimension, lymph node status and presence or absence of distance metastases. The risk of lymph node metastases is correlated with tumor size, invasion and grading. Risk factors Benign perianal pathology - perianal fissures and fistulas determine a chronic local inflammation that can lead to genetic alterations and have been incriminated as being etiologic factors.

Rectal cancer on skin, recent studies did not show a significant correlation between this pathology and the development of anal carcinoma 8.

rectal cancer on skin

Sexual activity - according to a study lead by Daling, patients with anal cancer had genital papillomatosis, type II HSV and Chlamydia trachomatis infections in their medical history. In the case of male patients, homosexuality, bisexuality, history of genital papilomatosis or gonorrhea have been associated to a higher risk of anal cancer 9. Another study, published peritoneal cancer geneadds to the risk factors, for females: history of gonorrhea, uterine cervix dysplasia, more than 10 sexual partners, anal sexual intercourse; for male rectal cancer on skin  syphilis is another risk factor HPV infection - it is the widest spread sexually transmitted infection in Europe Anal HPV infection can be clinically inapparent or it may manifest as condyloma.

Of all HPV subtypes, subtype 16 is the most frequently incriminated as carcinogen.

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Viral transmission is not influenced by the use of condoms as it is localized at the base of the penis and scrotum. Cigarette smoking - a study conducted in the early s highlighted a relative risk of 1. Carcinogenesis associated to cigarette smoking can be linked to an anti-androgenic effect of tobacco. HIV infection - some studies showed an increase in anal canal cancer in seropositive patients.

TR Microsatellite instability MSI Instabilitatea microsatelitară MSI este o afecțiune care apare pe ADN-ul celulelor specifice cum ar fi celulele canceroase unde numărul de microsateliți repetiții scurte ale secvențelor ADN din aceste celule este diferit de repetările care au existat în ADN atunci când a fost moștenit. Această instabilitate este cauzată de funcționarea defectuoasă a mecanismului de reparare mecanismul de reparare a erorilor de replicare ADN, MMR a erorilor în timpul replicării ADN-ului. Microsateliții, sau tandemuri scurte repetitive, sunt secvențe repetitive de ADN cu funcție necunoscută în genom, care apar stabile pe durata existenței unui individ. Cu toate acestea, fluctuațiile în lungimea microsatelitului, numită instabilitate, pot însemna că genele de reparare a erorilor de replicare nu funcționează corect. Repararea defectuoasă a erorilor de replicare este cauzată în cea mai mare parte de o anomalie de metilare a genei rectal cancer on skin reparare a erorilor de replicare MLH1, care este în primul rând un eveniment sporadic neereditar.

The severity and length of HPV infection are inversely proportional correlated to CD4 lymphocyte number. Immunocompromised patients, either due to HIV infection or to post-transplantation status or chemotherapy, have an increased risk of HPV infection and progression to squamous cell carcinoma Anatomy Surgical anal canal spreads from ano-rectal ring 2 cm above the dentate line to papilloma virus pe piele tratament external anal orifice.

Anal cancer must be distinguished from anal margin rectal cancer on skin that originates from the skin that presents perianal hair. Some authors consider a 5 cm distance from the external anal orifice as the lateral limit The correct classification of perianal neoplasia into the two mentioned categories is extremely important as those of anal margin are of better prognosis.

Altogether, an erroneous classification could overestimate the role of radio-chemotherapy Pectinate line represents an extremely important landmark for the vascularization and lymph node drainage. Thus, above this line, venous drainage is to the portal circulation, by way of inferior mesenteric vein and below venous blood drains into systemic circulation through pudendal and hypogastric veins.

Above the pectinate line lymphatics drain into rectal cancer on skin inferior mesenteric, but also to hypogastric and obturatory lymph nodes, while below pectinate line-especially to inguinal lymph nodes, but also to femoral ones Due to the resemblance to benign perianal pathology, the diagnosis is too often delayed. Clinical examination consists in the inspection of perianal skin, anal margin, rectal examination and anoscopy and should indicate tumor localization above or below the pectinate line or its pertaining to anal margin.

Bilateral inguinal region palpation is mandatory due to the lymphatic drainage to those lymphatic groups.

Echo-endoscopy points our eventual loco-regional lymphadenopathies and gynecologic examination can indicate the coexistence of a uterine cervix lesion. The diagnostic of certainty is based on histopathologic examination. Bioptic samples rectal cancer on skin be easily obtained with the patient in gynecological position; however, colonoscopy with exploration up to the cecum is obligatory to exclude eventual synchronous lesions.

As oxiuros en perros other paraclinical investigations, a CT examination of the thorax, abdomen and pelvis or an MRI is recommended to point out possible secondary tumors. Untill the s, standard treatment consisted in abdominoperineal rectal amputation. For patients having small lesions, a large local excision has been proposed, accompanied however by disappointing results, excepting patients with a smaller than 2 cm anal margin cancer Abdominoperineal rectal amputation is the standard salvage therapy for patients who develop local recurrences.

Tumor invasion into neighboring organs is not a contraindication of resection, provided a R0 resection is achieved. This fact has lead to the use of rotated or advanced musculocutaneous flaps to ameliorate the healing process. Provided the pelvic disease is controlled, isolated liver or lung metastases have indications for surgical resection.

rectal cancer on skin

Due to significant morbidity and the relatively low impact on survival, prophylactic inguinal lymphadenectomy is not recommended Inguinal lymphadenectomy is indicated for rectal cancer on skin with voluminous lymphatic blocks or to those with an obvious lymphadenopathy after chemo-radiotherapy Some authors recommend for rectal cancer on skin lymphadenopathies inguinal lymphadenectomy with chemo- and radiotherapy following the healing of the wound.

For metachronous lymphadenopathies, the treatment consists of lymphadenectomy followed by radiotherapy. The complications of the intervention consist in: wound dehiscence, hematomas, seromas, lymphoceles and lymphedema.

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Cancer ; 85 8 — 7. Gastrointestinal stromal tumor of the anus.

Anal canal cancer diagnosis and treatment aspects

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Cancerul de canal anal - aspecte legate de diagnostic și tratament

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Salvage abdomino-perineal resection after failed Nigro protocol: modest succes, major morbidity. Colorectal Dis.

Этих древних записей сохранилось очень мало; обычно считалось (хотя никто и не знал, по какой причине), что некогда, между появлением Пришельцев и строительством Диаспара, все воспоминания о первобытной жизни были утрачены.

Salvage abdominoperineal resection following combined chemotherapy and radiotherapy for epidermoid carcinoma of the anus. Ann Surg Oncol ; 1: Results of surgical salvage after failed chemoradiation therapy for epidermoid carcinoma of the anal canal. Ann Surg Oncol.

Malignant tumors of the anal canal: the spectrum of disease, treatment and outcomes. Appraisal of the treatment of carcinoma of the anus and anal canal. Surg Gynecol Obstet ; Surgical management of metastatic inguinal lymphadeopathy. Recurrent epidermoid cancer of the anus.

Cancerul de canal anal - aspecte legate de diagnostic și tratament

Cancer ; Basal cell carcinoma of the perianal region. Dis Colon Rectum ; Cummings BJ. Oncology ; Does an erroneous diagnosis of squamous-cell carcinoma of the anal canal and anal margin at first physician visit influence prognosis? Metastases to the lymph nodes in epidermoid carcinoma of the anal canal studied by a clearing technique.