title: MRI diagnosis of intradural extramedullary tumors.
abstract: OBJECTIVE
  This study evaluates the magnetic resonance imaging (MRI) manifestation of intradural extramedullary (IDEM) tumors to improve the imaging diagnostic level.
  
  
  METHODS
  From January 2005 to December 2012, a retrospective analysis of the MRI examination was performed on 108 patients with IDEM tumors confirmed by surgical pathology postoperatively in our hospital. According to the pathological classification; the gender, age, location, size, foraminal state extension, signal intensity (compared with the spinal cord), and enhancement were recorded and statistically analyzed.
  
  
  RESULTS
  A total of 108 cases (111 lesions) were reported; 69 (70 lesions), 31 (31 lesions), three (five lesions), four (four lesions), and one (one lesion) of which were schwannoma, meningioma, neurofibroma, teratoma, and metastatic tumor, respectively. MRI manifestations of different IDEM tumors have certain specificities.
  
  
  CONCLUSIONS
  MRI is the preferred examination method for to diagnose IDEM tumors and provide a reliable imaging basis for clinical treatment and prognosis judgment.
authors.forename: Rui
authors.initials: R
authors.lastname: Gu
authors.affiliation: Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun, China.
authors.forename: Jia-Bei
authors.initials: JB
authors.lastname: Liu
authors.forename: Qiao
authors.initials: Q
authors.lastname: Zhang
authors.forename: Guang-Yao
authors.initials: GY
authors.lastname: Liu
authors.forename: Qing-San
authors.initials: QS
authors.lastname: Zhu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016477:Artifacts; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000473:pathology; D008579:Meningioma / Q000175:diagnosis* / Q000473:pathology; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009442:Neurilemmoma / Q000175:diagnosis* / Q000473:pathology; D009455:Neurofibroma / Q000175:diagnosis* / Q000473:pathology; D011379:Prognosis; D012189:Retrospective Studies; D013116:Spinal Cord / Q000473:pathology; D013120:Spinal Cord Neoplasms / Q000175:diagnosis* / Q000473:pathology; D013724:Teratoma / Q000175:diagnosis* / Q000473:pathology; D055815:Young Adult