There are two kinds of cases: 1. Bony protrusions at the sternal process and the sternal angle; the sternal process is located at the lowermost end of the sternum, and the sternal angle is the obvious bony protrusion at the position where the sternal body is connected with the sternal stalk; these two positions can be obviously felt when massaged by hand, and no special treatment is needed if there is no related pain or other symptoms. 2. It is best to go to the hospital for CT scan examination to check the specific size and location of the chondrosarcoma, and it is best to remove it surgically, especially if the size of the chondrosarcoma increases significantly and there is pain and other symptoms, it must be removed surgically in order to play a curative role. Surgery is necessary to cure chondrosarcoma.