Differential diagnosis of the bowler hat sign.
D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D004241:Diverticulum, Colon / Q000000981:diagnostic imaging; D006801:Humans; D007417:Intestinal Polyps / Q000000981:diagnostic imaging*; D011859:Radiography