Rheumatoid iliopsoas bursitis presenting as unilateral leg edema.

A 66-year-old woman with rheumatoid arthritis presented with unilateral leg edema attributable to an enlarged iliopsoas bursa with presumed impedance of lymphatic drainage. The adjacent hip joint was not severely involved by arthritis. Ultrasonography and computed tomography were used to delineate the bursal mass and demonstrate communication with the joint space.