title: [Diagnostic difficulties in a case of Ewing's sarcoma of the femur].
mesh_terms: D001706:Biopsy; D002675:Child, Preschool; D005266:Femoral Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008297:Male; D011859:Radiography; D012512:Sarcoma, Ewing / Q000000981:diagnostic imaging* / Q000473:pathology
vernacular_title: Trudności rozpoznawcze w przypadku guza Ewinga kości udowej