label: Chondrosarcoma
label_lc: chondrosarcoma
description: "A malignant cartilaginous matrix-producing mesenchymal neoplasm arising from the bone and soft tissue.  It usually affects middle-aged to elderly adults.  The pelvic bones, ribs, shoulder girdle, and long bones are the most common sites of involvement.  Most chondrosarcomas arise de novo, but some may develop in a preexisting benign cartilaginous lesion."