Oral radiological evaluation of the biliary tract.
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Three patients are described with unusual collections of cholecystographic contrast material in the right upper abdomen medial and posterior to the gallbladder, in a characteristic "incomplete ring" configuration. Subsequent barium examinations of the upper gastrointestinal tract proved each of these collections to represent contrast material trapped in active duodenal ulcer craters. This cholecystographic sign, though uncommon, is believed to be fairly specific for duodenal ulcer. Recognition of the "incomplete ring" sign should prompt the radiologist to obtain barium studies necessary to confirm the presence of ulcer.
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