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Cortical auditory disorder caused by bilateral temporal infarctions

K Ishii1, Y Ueda, N Ohkoshi

  • 1Department of Neurology, University of Tsukuba, Ibaraki.

Internal Medicine (Tokyo, Japan)
|August 1, 1995
PubMed
Summary
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A man experienced sudden bilateral hearing loss, with normal brainstem auditory evoked potentials but absent middle latency auditory evoked potentials. Brain imaging revealed bilateral temporal lobe infarctions, indicating a cortical auditory disorder.

Area of Science:

  • Neuroscience
  • Audiology
  • Neurology

Background:

  • Cortical auditory disorders are rare conditions affecting sound recognition.
  • Bilateral temporal lobe lesions can lead to complex auditory processing deficits.

Observation:

  • A 55-year-old male presented with acute bilateral auditory disturbance.
  • Auditory acuity was relatively preserved, but sound recognition was impaired.
  • Brainstem auditory evoked potentials (BAEPs) were normal.

Findings:

  • Middle latency auditory evoked potentials (MLAEPs) showed a complete absence of waves.
  • Brain computed tomography (CT) revealed bilateral temporal lobe infarctions, specifically in the superior temporal and transverse temporal gyri.
  • Impaired recognition of both verbal and nonverbal sounds was confirmed.

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Implications:

  • This case highlights the diagnostic utility of MLAEPs in identifying subcortical auditory pathway dysfunction.
  • Brain CT and auditory recognition tests are crucial for diagnosing cortical auditory disorders.
  • The findings underscore the role of the superior temporal gyri in auditory processing and sound recognition.