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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Iatrogenic duodenal perforation is a rare complication of endoscopy and is usually suspected at the time of endoscopic examination. Perforation may be due to rupture from the endoscope or from an extended sphincterotomy. Typical CT findings include retroperitoneal air and fluid adjacent to the duodenum (Fig 7).