Large cysts in lower leg originating in the knee occurring in patients with rheumatoid arthritis

Abstract

Abstract Four patients are presented with rheumatoid arthritis who have had long term steroid therapy with unusual cysts in the posterior aspect of the lower portion of the leg connected with the joint cavity. The diagnosis may be confused with thrombophlebitis of the leg veins. Arthrograms clarify the diagnosis. The mechanism formation of these cysts is unclear, but may be due partly to weakening of the connective tissue by prolonged steroid therapy. The cysts disappear and recur with remission and exacerbation of the rheumatoid process. Surgical excision of the cysts relieves the discomfort but recurrence is frequent.