Cancer of the rectum.
D000328:Adult; D000367:Age Factors; D006801:Humans; D007417:Intestinal Polyps / Q000175:diagnosis; D008875:Middle Aged; D010173:Palpation; D011859:Radiography; D012004:Rectal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012812:Sigmoidoscopy