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Patulous internal auditory canal.

Lela Migirov1

  • 1Department of Otolaryngology-Head and Neck Surgery, Sheba Medical Center, Tel Hashomer, Israel. kro@zahav.net.il

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|September 17, 2003
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Summary
This summary is machine-generated.

A rare internal auditory canal anomaly, patulous canal, was investigated for its link to hearing loss. This study found the condition is an incidental finding in patients with middle ear disease and conductive hearing impairment.

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Area of Science:

  • Otolaryngology
  • Radiology
  • Anatomy

Background:

  • The internal auditory canal (IAC) is a crucial bony channel housing the vestibulocochlear nerve.
  • Patulous canal, an uncommon IAC variant, has been infrequently associated with auditory dysfunction.

Purpose of the Study:

  • To determine the prevalence of patulous canal.
  • To explore the relationship between patulous canal and hearing impairment.

Main Methods:

  • High-resolution computed tomography (HRCT) scans of 645 temporal bones were reviewed.
  • Patient medical records were analyzed for demographics and audiological status.

Main Results:

  • A patulous canal was identified in 2 patients (0.3%) without labyrinthine anomalies.
  • Both identified patients presented with chronic middle ear disease and conductive hearing loss.

Conclusions:

  • Patulous canal is a rare anatomical variant of the internal auditory canal.
  • The association with conductive hearing loss in this study appears incidental, likely secondary to coexisting middle ear pathology.