Malignant melanoma of the anal canal.
D000368:Aged; D001005:Anus Neoplasms / Q000473:pathology*; D001706:Biopsy; D006801:Humans; D008175:Lung Neoplasms; D008297:Male; D008545:Melanoma / Q000473:pathology*; D009362:Neoplasm Metastasis