A rare type of cancer that forms in cartilage near bones. It usually occurs in the thigh, knee, buttock, or trunk (chest and abdomen). The tumor may grow large and spread to nearby tissue or to other parts of the body, including the lymph nodes and lungs. It may also recur (come back) many years after treatment. The cancer cells usually have a certain genetic change called a translocation (part of one chromosome switches places with part of another chromosome). Extraskeletal myxoid chondrosarcoma usually occurs in middle-aged or older adults, and is rare in children and adolescents. It is a type of soft tissue sarcoma.