Malignant melanoma of the anal canal.
D000328:Adult; D000368:Aged; D001005:Anus Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D005260:Female; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy; D008875:Middle Aged