Segmental narrowing of the sigmoid colon.
D000230:Adenocarcinoma / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006801:Humans; D007415:Intestinal Obstruction / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012811:Sigmoid Neoplasms / Q000000981:diagnostic imaging*