A rare case of cutaneous metastasis of distal phalanx chondrosarcoma.

Chondrosarcoma is the second-most common primary malignant bone tumor but chondrosarcoma of small bones of the hand is extremely rare, representing less than 2% of all cases, with exceedingly rare skin metastases. Cutaneous metastases of chondrosarcoma represent less than 3% of all cutaneous metastases. According to PubMed, there are only four previous case reports of cutaneous metastases originating from chondrosarcoma of small bones of the hand. We present an additional case of cutaneous metastases of phalangeal chondrosarcoma with a unique immunophenotype.