To get back obtain, remember to make sure that cookies and JavaScript are enabled prior to reloading the site.?? ?? ????? ?? ??? ?? ??? ??? ???? ????. About 87 percent of Ewing sarcomas are Ewing sarcoma of bone, and that is a bone tumor that usually happens inside the thigh bones (femurs), pelvis, ribs, or shoulder blades. Extraosseous (or extras