title: Causes of unilateral sensorineural hearing loss screened by high-resolution fast spin echo magnetic resonance imaging: review of 1,070 consecutive cases.
abstract: OBJECTIVE
  Evaluation of the ability of screening high-resolution, nonenhanced, fast spin echo (FSE) T2-weighted magnetic resonance imaging (MRI) of the internal auditory canal (IAC) and cerebellopontine angle (CPA) to detect nonacoustic schwannoma causes of unilateral sensorineural hearing loss (SNHL). FSE-MRI is equally sensitive in detecting acoustic (vestibular) schwannoma as gadolinium-enhanced MRI, but sensitivity to other causes of hearing loss is unknown.
  
  
  METHODS
  Retrospective review of screening FSE-MRI studies.
  
  
  METHODS
  Academic otology/neurotology and neuroradiology practices.
  
  
  METHODS
  There were 1,070 patients with unilateral SNHL who underwent radiologic screening for retrocochlear pathology.
  
  
  RESULTS
  Normal findings were found in 944 cases. Typical (acoustic) vestibular schwannoma were found in 56 patients. Seventy additional lesions were identified: 27 CPA lesions, 29 inner ear lesions, and 12 intraaxial lesions including 9 infarctions, 1 multiple sclerosis case, 1 mesial temporal lobe sclerosis, and 1 colloid cyst.
  
  
  CONCLUSIONS
  High-resolution T2 FSE-MRI of the IAC and CPA is a highly sensitive screening tool for unilateral SNHL, which can detect a variety of lesions in addition to vestibular schwannomas. To our knowledge in 2 years of follow-up in these patients screened for IAC/CPA lesions, no other lesions causing SNHL have been found. High-resolution FSE screening technique, used in conjunction with appropriate clinical prescreening and referral, can provide an equally sensitive method of evaluating unilateral SNHL compared to gadolinium-enhanced T1 MRI while reducing costs and providing distinct advantages in evaluating nonacoustic schwannoma causes of SNHL.
authors.affiliation: The Ohio State University, Department of Otolaryngology, Columbus, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Daniels
authors.forename: C
authors.initials: C
authors.lastname: Swallow
authors.forename: C
authors.initials: C
authors.lastname: Shelton
authors.forename: H C
authors.initials: HC
authors.lastname: Davidson
authors.forename: C S
authors.initials: CS
authors.lastname: Krejci
authors.forename: H R
authors.initials: HR
authors.lastname: Harnsberger
mesh_terms: D000328:Adult; D002530:Cerebellopontine Angle / Q000473:pathology*; D003051:Cochlea / Q000473:pathology*; D003390:Cranial Nerve Neoplasms / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology; D017352:Echo-Planar Imaging / Q000379:methods*; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D008297:Male; D009103:Multiple Sclerosis / Q000150:complications; D009464:Neuroma, Acoustic / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology; D012189:Retrospective Studies