Mesenchymal chondrosarcomas of the head and neck.

Mesenchymal chondrosarcoma, in both osseous and extra-skeletal forms, has a decided predilection for the head and neck region. The two cases presented in this report affirm this tendency and also illustrate the capricious biologic behavior of the neoplasms as manifested by the 30 additional cases recorded in the literature. Histopathologic confusion with hemangiopericytoma is avoided by identification of the cartilage component in the mesenchymal chondrosarcoma and by the undifferentiated nature of the cellular (non-cartilaginous) component.