title: [Primary intra-meatal invasion of meningioma into the left meatus acusticus internal in a 49-year-old woman].
abstract: BACKGROUND
  Meningiomas originating in the internal auditory meatus are rare and have been reported in only 12 cases.
  
  
  METHODS
  We report about another case, which showed primarily the symptoms of sudden hearing loss and diagnostic signs of an intrameatal acoustic neuroma. The ABR interpeak latency IV was prolonged. The tumor was detected by MRI scan with gadolinium contrast enhancement and resembled the features of an intrameatal acoustic neuroma.
  
  
  RESULTS
  The tumor was removed via a middle fossa approach with preservation of hearing and facial nerve function. Histological examination however revealed a meningioma originating from the internal auditory meatus.
  
  
  CONCLUSIONS
  Contrast enhancing intrameatal tumors are most often acoustic neuromas. However even despite subtile audiological and neurotological examination and sophisticated imaging techniques they cannot be differentiated clinically from meningiomas at this location. Removal of the intrameatal tumor via a middle fossa approach seems to be the best surgical approach to preserve hearing and facial nerve function.
authors.affiliation: HNO-Klinik, Medizinischen Hochschule Hannover.
authors.forename: I
authors.initials: I
authors.lastname: Buchsteiner
authors.forename: R
authors.initials: R
authors.lastname: Heermann
authors.forename: A
authors.initials: A
authors.lastname: Brandis
authors.forename: T
authors.initials: T
authors.lastname: Lenarz
mesh_terms: D001301:Audiometry, Pure-Tone; D004007:Dichotic Listening Tests; D004428:Ear Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D007758:Ear, Inner / Q000473:pathology / Q000601:surgery; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis