????? ??? ?? ?? ?? ? ?? ??? ?? ???? , ?? ??? ????? ??? ?? ?? ?? ????? ??? ?? ?? ?? ???? ?? ??? ?? ??? ??? ?? ??? ? ??? ??? ?? ????.?? ?? ????? ?? ??? ?? ??? ??? ???? ????. About 87 p.c of Ewing sarcomas are Ewing sarcoma of bone, that is a bone tumor that sometimes happens inside the thigh bones (femurs), pelvis, ribs, or shoulder blades. Extraoss