Malignant melanoma of the anal canal.
D000328:Adult; D000368:Aged; D001005:Anus Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D012809:Colon, Sigmoid / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008545:Melanoma / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D011379:Prognosis; D012007:Rectum / Q000601:surgery