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Cochlear dysplasia and meningitis

P D Phelps1, A King, L Michaels

  • 1Royal National Throat, Nose, and Ear Hospital, London, UK.

The American Journal of Otology
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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Congenital inner ear malformations can cause hearing loss and meningitis risk. The basal turn of the cochlea on imaging predicts hearing potential and fistula risk in these patients.

Area of Science:

  • Otolaryngology
  • Neuroscience
  • Radiology

Background:

  • Congenital inner ear dysplasias are linked to hearing loss.
  • Some cases present with cerebrospinal fluid otorhinorrhea or meningitis due to fistulous tracts.
  • The specific deformities predisposing to fistulas are not well-defined.

Observation:

  • This study correlated hearing status with imaging in 20 patients with congenital labyrinthine malformations, focusing on the cochlea.
  • Histologic findings from a patient with severe cochlear dysplasia and otogenic meningitis were also examined.

Findings:

  • The basal turn of the cochlea is critical for assessment.
  • A present, normally-calibered basal turn suggests possible hearing and no major fistula risk.
  • An enlarged basal turn or undeveloped sac indicates anacusis (total hearing loss) and a high risk of fistula.

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Implications:

  • Patients with enlarged basal turns or undeveloped sacs require labyrinth packing with fibrofatty tissue after a single meningitis episode.
  • This imaging-based assessment aids in managing congenital inner ear malformations and associated risks.