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1 Retroperitoneal abscess: An abscess (pus-filled cavity) in the retroperitoneal area (space behind the abdominal cavity).
Retroperitoneal fibrosis occurs when extra fibrous tissue forms in the area behind the stomach and intestines. The tissue forms a mass (or masses) that can block the tubes that carry urine from the kidney to the bladder. The cause of this problem is not known. It is most common in people aged 40 - 60.