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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Medical Definition of retroperitoneum. plural. retroperitoneums. or. retroperitonea. \-ËÄ-É\play. : the space between the peritoneum and the posterior abdominal wall that contains especially the kidneys and associated structures, the pancreas, and part of the aorta and inferior vena cava.