Abstract
In black skin, the epidemiology of anal melanocytic tumors is little studied and is generally based on reported cases. Anal localization is characterized by its rarity, and its non-consensual management. In this study we describe and discuss the anatomopathological aspects which led to the fortuitous discovery of a case of nevus and a case of melanoma of anal location. The cases involved samples taken from a 30-year-old female and a 75-year-old male. Both examinations concerned surgical pieces received fixed. Histological and immunohistochemical examination was performed for both observations. In the case of the nevus, the histological appearance was misleading and difficult, initially evoking a melanoma. The diagnosis of the melanoma case was easier and confirmed by a positive HMB45 staining. In proctology, melanocytic tumors are rare with a variable and nonspecific clinical presentation. Melanoma on black skin occurs in locations that are not photo-exposed mucous membranes with a poor prognosis.
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