Sternoclavicular Joint Swelling in a Patient with Rheumatoid Arthritis

The sternoclavicular joint is a diarthrodial joint that can be involved in rheumatoid arthritis (RA), and is detectable by ultrasound (US) examination in 15% of patients with RA1. Methotrexate-related lymphoproliferative disorder (MTX-LPD) occurs in extranodal sites in about 40%–50% of the affected patients2; however, intraarticular MTX-LPD is a very rare manifestation with only 1 case report occurring in the knee joint3 …