To regain accessibility, remember to Guantee that cookies and JavaScript are enabled right before reloading the site.????? ? ?? ???? ??? ??? ???? ????? ??? ????? ???? ?????? ???? ?? ?? ????? ???? ? ?? ??? ?????????. ?????.Around 87 % of Ewing sarcomas are Ewing sarcoma of bone, that's a bone tumor that usually occurs within the thigh bones (femurs)