title: Pitfalls to avoid: spasm in ulcerative colitis masquerading as carcinoma.
abstract: A barium enema on a patient with chronic ulcerative colitis demonstrated a stricture with the radiographic characteristics of an annular carcinoma. The "lesion" disappeared following administration of glucagon.
mesh_terms: D003093:Colitis, Ulcerative / Q000150:complications / Q000000981:diagnostic imaging*; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D013035:Spasm / Q000000981:diagnostic imaging* / Q000209:etiology