Recurrent benign retroperitoneal lipoma.

A case of a rare recurrent lipoma originating from the perirenal fat is reported. Onset of symptoms (abdominal pain, weight loss, appetite loss, abdominal swelling, nausea, constipation) is late and the treatment is surgical, but postoperative radiation or chemotherapy may be indicated. Ultrasound, CT and NMR scans, pyelograms and barium enemas are the most important diagnostic investigations. Follow-up in these patients is important.