[A case of cloacogenic carcinoma with extra-visceral localization]

Cloacogenic carcinoma is a rare form of neoplasia (4-14% of tumours of the colon-rectum) which occurs on the transitional epithelium of anal canal. An extra-visceral location is rare. The paper reports a case of cloacogenic carcinoma sited on the perianal skin, treated with radiotherapy and local surgical excision. It is important to perform a biopsy and a thorough endoscopic examination of all ano-perianal lesions in order to separate those of dermatological relevance from those of surgical relevance, and at the same time to determine the exact histological type of the latter group so as to select the correct therapeutical approach.