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Synovial cysts in rheumatoid arthritis (RA), most common in the popliteal fossa,1,2 have also been described in proximity to several other rheumatoid joints,3–9 but never the sternoclavicular joints.
CASE REPORT
We here describe, for the first time, the development of unusually large synovial cysts, from the disproportionately small sternoclavicular joints, in a 58 year old man, with a 27 year history of severe, seropositive, erosive, destructive, deforming, nodular RA. Over the years he had been treated, albeit erratically, with several disease modifying antirheumatic drugs (DMARDs), but he had been poorly followed up.
Seven months ago, while receiving d-penicillamine 500 mg/day and methylprednisolone 2 mg/day, he presented with a 10 cm long and 5 cm thick, fluctuant, non-tender, sausage-like mass over the right clavicle, and a smaller one, about 5 cm …