title: The valve of barium-enema studies in patients with carcinoma of the rectum.
mesh_terms: D001005:Anus Neoplasms / Q000000981:diagnostic imaging; D001466:Barium Sulfate; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging; D004733:Enema; D005188:False Negative Reactions; D005189:False Positive Reactions; D006801:Humans; D011351:Proctoscopy; D011859:Radiography; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging*
chemical_list: D001466:Barium Sulfate