[Difficult diagnosis of Ewing's sarcoma in the lumbosacral region].
D000293:Adolescent; D001859:Bone Neoplasms / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008161:Lumbosacral Region; D008297:Male; D009447:Neuroblastoma / Q000175:diagnosis; D012512:Sarcoma, Ewing / Q000175:diagnosis*; D012585:Sciatica / Q000175:diagnosis