Thumb polydactyly associated with secondary chondrosarcoma arising from a solitary enchondroma: A rare case report

The most common type of polydactyly in the hand is thumb polydactyly. Enchondromas are benign cartilaginous tumors and usually present in phalanx of hands. Transformation of enchondromas into chondrosarcomas is very rare, which is commonly associated with multiple enchondromatous lesions. Association of thumb polydactyly and secondary chondrosarcoma arising from a solitary enchondroma is even rarer. We present a 50-year-old female patient with right thumb polydactyly associated with secondary chondrosarcoma arising from a solitary enchondroma. To our knowledge this association has not been described previously.