Giant intraosseous synovial cyst with intraarticular communication with the ankle joint in longstanding rheumatoid arthritis

摘要

The term "intraosseous synovial cyst" is used to designate the epiphyseal cyst-like lesions seen in a variety of clinical settings. Extraarticular synovial cysts in rheumatoid arthritis (RA) have rarely been documented in case reports. The same is true for giant intraosseous synovial cysts with intraarticular communication. We describe an adult case of RA with uncontrolled disease, involving a giant intraosseous synovial cyst in the lower end of the tibia and communicating with the ankle joint.