Synovial cyst of the pes anserinus in a patient with rheumatoid arthritis presenting as intermittent claudication.

Case Description A 56-year-old woman with rheumatoid arthritis for the previous 10 years was affected mainly in her hands and wrist. Treatment with non-steroidal antiinflammatory medications and steroids had good functional results. A few months before admission she started suffering from intermittent claudication in her right leg, which became so severe that she could only walk 30–50 meters without stopping. Physical examination of the lower limbs, especially the knee joints, were reported as normal by her rheumatologist and no vascular or neurological deficit was noted. Routine blood tests were normal, except for positive rheumatoid factor and elevated erythrocyte sedimentation rate. X-ray radiographs were normal.