title: Malignant melanoma of the anorectum.
mesh_terms: D001003:Anal Canal / Q000473:pathology; D001005:Anus Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D008545:Melanoma / Q000473:pathology*; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000473:pathology*; D012007:Rectum / Q000473:pathology