title: Primary thoracolumbar Ewing's sarcoma presenting as isolated epidural mass.
abstract: BACKGROUND
  Ewing's sarcoma is the most common childhood malignancy of bone, but it rarely occurs as a primary extraosseous epidural tumor.
  
  
  OBJECTIVE
  To heighten awareness and treatment options of this rare (epidural) presentation of Ewing's sarcoma.
  
  
  METHODS
  Case report.
  
  
  METHODS
  Retrospective review.
  
  
  RESULTS
  We present a 13-year-old boy with progressive low back and bilateral lower extremity pain and normal neurologic examination. Magnetic resonance imaging showed an extradural tumor in the dorsal epidural space from T11 to L1. He underwent a posterior laminoplasty and gross total resection of tumor; histopathological diagnosis was consistent with Ewing's sarcoma. After surgery, the patient underwent adjuvant chemotherapy and irradiation. At 10 months follow-up, the patient is neurologically intact without evidence of residual disease.
  
  
  CONCLUSIONS
  Ewing's sarcoma of the epidural space should be considered in the differential diagnosis of epidural mass lesions. Because wide surgical margins cannot be obtained, close follow-up with a low threshold for reoperation is mandatory.
authors.affiliation: Department of Neurosurgery, Uludag University, Bursa, Turkey.
authors.forename: Seref
authors.initials: S
authors.lastname: Dogan
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Leković
authors.forename: Nicholas
authors.initials: N
authors.lastname: Theodore
authors.forename: Eric M
authors.initials: EM
authors.lastname: Horn
authors.forename: Jennifer
authors.initials: J
authors.lastname: Eschbacher
authors.forename: Harold L
authors.initials: HL
authors.lastname: Rekate
mesh_terms: D000293:Adolescent; D000971:Antineoplastic Combined Chemotherapy Protocols; D001859:Bone Neoplasms / Q000473:pathology; D003131:Combined Modality Therapy; D003937:Diagnosis, Differential; D015174:Epidural Neoplasms / Q000473:pathology* / Q000628:therapy; D004824:Epidural Space / Q000473:pathology*; D006801:Humans; D008159:Lumbar Vertebrae; D008279:Magnetic Resonance Imaging; D008297:Male; D019635:Neurosurgical Procedures; D011878:Radiotherapy; D012512:Sarcoma, Ewing / Q000473:pathology* / Q000628:therapy; D013904:Thoracic Vertebrae