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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
The on set of. perforation is acute in majority but can be gradual also. The perforated diverticulum should be considered in. the presence of bile stained phlegmon in the para-. duodenal area, retroperitoneal edema or emphysema, retroperitoneal yellow flaky exudates or pus or a right. sub-hepatic abscess.