metastatic ewing sarcoma prognosisewing sarcoma imagesewing sarcoma childhood cancerewing sarcoma mrimetastatic ewing sarcoma survival rateewing sarcoma cancer survival rateliposarcoma picturesstage 4 ewing's sarcoma survival rateewing sarcoma survival rate adultsmyxoid liposarcoma picturesewing sarcoma x ray findingsewing sarcoma prognosis