Extraskeletal mesenchymal chondrosarcoma of the forearm: a case report.

Mesenchymal chondrosarcomas represent less than 10% of all chondrosarcomas. The majority of these tumors arise from the skeleton; only 22% have an extraosseous origin. Of the extraskeletal locations, the meninges, brain, and thigh are the most common. Involvement of the forearm is a rare occurrence. This case report describes an extraskeletal mesenchymal chondrosarcoma involving the forearm.