title: Problems in the diagnosis of cancer of the colon by barium enema.
mesh_terms: D000368:Aged; D001466:Barium Sulfate; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007417:Intestinal Polyps / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging; D011859:Radiography
chemical_list: D001466:Barium Sulfate