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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
The retroperitoneal space (retroperitoneum) is the anatomical space (sometimes a potential space) in the abdominal cavity behind (retro) the peritoneum. It has no specific delineating anatomical structures. Organs are retroperitoneal if they have peritoneum on their anterior side only.