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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Peritoneal is a term referring or relating to a structure in the abdomen known as the peritoneum. Retroperitoneal, therefore, is a term meaning behind, in back of or posterior to the peritoneum, which is a membrane that serves as a lining for the anatomical space in the abdominal cavity.hen there is injury to any of the organs within the retroperitoneal space, pain and various sensations almost always will be felt in the patient's back. For example, in the case of an abdominal aortic aneurysm, a person often will complain of a tearing sensation in his or her back.