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Melanoma of the canal anal is a rare malignancy and due to the site of the lesion and the lack of early presenting signs and symptoms, the diagnosis is usually delayed (1,2,3). There is a peak incidence during the seventh decade of life and a marked predominance of female patients, being the hemorrhage, anal pain or anal mass the main complaints. Histologically, it is characterized by a great cellular variability, being able to mimic several other histological types. Thus the immunohistochemical stains, such as S 100 protein and the HMB-45, became a useful instrument in establishing the correct diagnosis. Although it’s a situation that folows with a very low longterm survival, there is no consensus in the best treatment option (3,5,6).

Anal Melanoma with satellite implantations on the lower rectum