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Related Experiment Videos

Brainstem response in cerebellopontine angle tumors.

N Marangos1, W Maier, R Merz

  • 1Department of Otorhinolaryngology, Albert-Ludwigs-University, Freiburg, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|April 21, 2001
PubMed
Summary

Auditory brainstem response (ABR) testing is not sufficient for early detection of small cerebellopontine angle (CPA) tumors. While normal ABR results were found in 18.4% of CPA tumors, smaller tumors showed a higher incidence of normal ABR.

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Area of Science:

  • Otolaryngology
  • Neurology
  • Diagnostic Imaging

Background:

  • Cerebellopontine angle (CPA) tumors can affect auditory pathways.
  • Auditory brainstem response (ABR) is a diagnostic tool used to assess these pathways.

Purpose of the Study:

  • To evaluate auditory brainstem response (ABR) findings in patients with cerebellopontine angle (CPA) tumors.
  • To specifically analyze cases with normal ABR results.

Main Methods:

  • Retrospective evaluation of ABR findings in 309 patients with radiographically confirmed CPA tumors.
  • Patients underwent audiologic examination, electronystagmography, ABR testing, and electrocochleography.
  • Tumors were categorized by ABR results, histology, and size (via MRI).

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Main Results:

  • Normal ABR results were observed in 18.4% of CPA tumors, with 50.2% showing no response.
  • Small vestibular schwannomas (under 15 mm) had a higher incidence of normal ABR (41.7%).
  • CPA tumors with normal ABR often presented with no hearing loss, symmetrical hearing loss, or cochlear deafness.

Conclusions:

  • The increasing detection of small CPA tumors with MRI may lead to a higher incidence of normal ABR results.
  • Auditory brainstem response (ABR) sensitivity decreases with smaller tumors.
  • ABR alone is insufficient for the early detection of small CPA tumors.