title: Sacral radiculopathy secondary to multicentric osteosarcoma.
abstract: METHODS
  A case of multicentric osteosarcoma presenting with sacral radiculopathy is reported.
  
  
  OBJECTIVE
  To present unusual clinical and radiologic findings of multicentric osteosarcoma.
  
  
  BACKGROUND
  Multicentric osteosarcoma is a rare variant of osteosarcoma. To the authors' knowledge, no cases of multicentric osteosarcoma presenting as sacral radiculopathy have been reported previously.
  
  
  METHODS
  A 14-year-old boy had a large sacral tumor extending into the spinal canal, which was found to account for the initial symptoms, which mimicked those of herniated nucleus pulposus. At diagnosis, a bone survey showed multiple foci of osteosarcoma in the long bones.
  
  
  RESULTS
  The patient was treated with chemotherapy, but died of the disease 8 months after the initial presentation.
  
  
  CONCLUSIONS
  Multicentric osteosarcoma should be considered in the differential diagnosis for a pediatric patient with low back pain and sciatica.
authors.affiliation: Department of Orthopaedic Surgery, Kobe University School of Medicine, Kobe, Japan. yamatetu@med.kobe-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: I
authors.initials: I
authors.lastname: Fujita
authors.forename: M
authors.initials: M
authors.lastname: Kurosaka
authors.forename: K
authors.initials: K
authors.lastname: Mizuno
mesh_terms: D000293:Adolescent; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001859:Bone Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000188:drug therapy; D017809:Fatal Outcome; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D012516:Osteosarcoma / Q000150:complications* / Q000175:diagnosis / Q000188:drug therapy / Q000556:secondary; D011843:Radiculopathy / Q000175:diagnosis / Q000209:etiology*; D011859:Radiography; D011877:Radionuclide Imaging; D012447:Sacrum / Q000000981:diagnostic imaging / Q000473:pathology*