Which of the following is true for chondrosarcoma?

Chondrosarcoma originates from remnants of cartilage within bones and most often involves the deeper portions of the pelvic bones of middle-aged or older people. It may arise in long bones, but the short bones of the hand and foot are rarely involved. The tumor is composed of malignant cartilage cells showing different degrees of maturation. Chondrosarcomas usually grow slowly.