Benign retroperitoneal schwannoma.

A rare case of benign retroperitoneal schwannoma in a 76-year-old man is reported. Ultrasound and computerized tomography disclosed two cystic retroperitoneal tumors sized 12 cm and 7 cm. The larger tumor was located anterior to psoas muscle and the smaller one was within the muscle. The larger tumor was excised via laparotomy. After 3.5 years follow-up the intramuscular tumor has remained unchanged and the patient has no symptoms.