Primary synovial chondromatosis of the first tarsometatarsal joint: a rare case report

Primary synovial chondromatosis is a rare condition and commonly involves a single large joint, although it may involve any synovial joint. It occurs as a result of metaplasia and focal formation of cartilage in the intimal layer of the synovial membrane. Diagnosis could be made after thorough clinical and radiological assessment. Diagnosis must be confirmed by histopathological examination, because malignant transformation has been reported. Here, we report a case of primary synovial chondromatosis on an extremely rare location involving the first tarsometatarsal joint.