???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????. ????? ? ?? ???? ??? ??? ???? ????? ??? ????? ???? ?????? ???? ?? ?? ????? ???? ? ?? ??? ?????????. ?????. Roughly 87 percent of Ewing sarcomas are Ewing sarcoma of bone, which can be a bone tumor that usuall