At angle between bulb and descending duodenum
Acute angulation as duodenum becomes retroperitoneal, accentuates fold
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May even simulate ulcerated mass, with barium trapped between mucosal folds
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Changeable appearance on upper GI fluoroscopy
May disappear on upright or left decubitus positioning, or with compression
Normal peristalsis
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Can simulate polypoid mass on CT as well
CT has disadvantage of not allowing real-time evaluation of changes with peristalsis or different positions
Related
Diagnostic Imaging_ Gastrointes - Michael P Federle
