Ewing's sarcoma.
D001706:Biopsy; D001859:Bone Neoplasms / Q000000981:diagnostic imaging*; D002648:Child; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D009362:Neoplasm Metastasis / Q000532:radiotherapy; D011859:Radiography; D012512:Sarcoma, Ewing / Q000000981:diagnostic imaging* / Q000532:radiotherapy