title: Osteoid osteoma--still a difficult problem.
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D005266:Femoral Neoplasms / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D008297:Male; D010017:Osteoma, Osteoid / Q000175:diagnosis* / Q000601:surgery