title: T2-weighted MR characteristics of internal auditory canal masses.
abstract: OBJECTIVE
  To determine whether masses of the internal auditory canal are hypointense relative to cerebrospinal fluid, and therefore visible, on fast spin-echo T2-weighted MR images.
  
  
  METHODS
  Forty-six patients had 50 masses of the internal auditory canal, identified initially on contrast-enhanced MR images, that were evaluated retrospectively for signal intensity of the mass with respect to cerebrospinal fluid and for visibility of the neural elements within the internal auditory canal on T2-weighted images.
  
  
  RESULTS
  Forty-seven of 50 masses were clearly identified on T2-weighted images. Three small abnormalities (2 to 4 mm) were not seen with confidence on T2-weighted images. However, on close inspection of these three masses, the small abnormality on contrast-enhanced MR images corresponded to a hypointense focus on T2-weighted images. All 50 masses were hypointense relative to cerebrospinal fluid on T2-weighted images.
  
  
  CONCLUSIONS
  All masses of the internal auditory canal in this study were hypointense relative to cerebrospinal fluid on T-2 weighted images, and were therefore visible.
authors.affiliation: Department of Radiology, University of Pittsburgh Medical Center, PA 15213, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Fukui
authors.forename: J L
authors.initials: JL
authors.lastname: Weissman
authors.forename: H D
authors.initials: HD
authors.lastname: Curtin
authors.forename: E
authors.initials: E
authors.lastname: Kanal
mesh_terms: D015331:Cohort Studies; D004428:Ear Neoplasms / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D007758:Ear, Inner / Q000294:innervation; D005260:Female; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008579:Meningioma / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D009420:Nervous System / Q000473:pathology; D009442:Neurilemmoma / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D012189:Retrospective Studies