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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
A retroperitoneal hematoma is a pocket of blood found in the lower back in an area known as the retroperitoneal space.reating a retroperitoneal hematoma through surgery involves evacuating the collected blood and stopping the cause of bleeding. Retroperitoneal hematomas may grow significantly enough to reduce blood flow to the rest of the body, because the blood is collecting in the peritoneal space.