title: Malignancy in a longstanding colon polyp.
mesh_terms: D000230:Adenocarcinoma / Q000000981:diagnostic imaging* / Q000601:surgery; D000368:Aged; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D007417:Intestinal Polyps / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D009362:Neoplasm Metastasis; D011859:Radiography