Abstract
A 50-year-old women presented with a swollen right leg. She had a history of osteoarthritis of both knees. In December 2004, she noticed a mild diffuse swelling of her entire right lower limb. Computed tomography demonstrated a 3 × 3 cm low density mass anterior to the iliopsoas muscle, compressing the femoral vein. We diagnosed iliopsoas bursitis because of the cystic mass near the iliopsoas muscle. We performed aspiration of the cystic mass under ultrasound-guided puncture. Surgical removal of the cyst was performed because the residual mass was compressing femoral vein even after aspiration. At operation a large, thick-walled cystic mass was found extending to the femoral vein, extending from the right iliac fossa. Postoperative course was uneventful.
