title: Retroperitoneal neurilemoma: CT and MR findings.
abstract: OBJECTIVE
  Our objective was to characterize the CT and MR imaging findings of retroperitoneal neurilemomas.
  
  
  METHODS
  We reviewed the CT and MR imaging findings in six women with retroperitoneal neurilemomas.
  
  
  RESULTS
  Retroperitoneal neurilemomas were round, 5-13 cm in diameter, and located in the presacral pelvic retroperitoneum in four patients and adjacent to the kidney in two patients. CT findings of the tumors were well-demarcated round masses showing prominent cystic changes and oriented in a somewhat radial fashion. Medium and heavily T2-weighted MR images showed high-intensity necrotic areas and nonnecrotic areas of various signal intensity.
  
  
  CONCLUSIONS
  CT findings of a round mass with prominent cystic degeneration, along with certain MR imaging characteristics, may be helpful in the preoperative diagnosis of retroperitoneal neurilemomas.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, Korea.
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
authors.forename: B I
authors.initials: BI
authors.lastname: Choi
authors.forename: M C
authors.initials: MC
authors.lastname: Han
authors.forename: Y I
authors.initials: YI
authors.lastname: Kim
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009442:Neurilemmoma / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed