title: Hypersensitivity reactions after barium enema examination.
abstract: Three patients who developed urticaria shortly after air-contrast barium enema studies of the colon are described. Only a single similar instance was found in the literature. One of the patients had a positive prick skin test to methylparaben, which was the preservative in the barium mixture used and, therefore, is presumed to be the responsible allergen.
mesh_terms: D000328:Adult; D001466:Barium Sulfate / Q000009:adverse effects*; D003106:Colon / Q000000981:diagnostic imaging; D004733:Enema; D005260:Female; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000139:chemically induced*; D008297:Male; D008875:Middle Aged; D010226:Parabens / Q000009:adverse effects; D011859:Radiography; D014581:Urticaria / Q000139:chemically induced
chemical_list: D010226:Parabens; D001466:Barium Sulfate; C015358:methylparaben