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Cochlear ossification after meningitis

P R Axon1, R H Temple, S R Saeed

  • 1Department of Otolaryngology, Manchester Royal Infirmary, United Kingdom.

The American Journal of Otology
|November 27, 1998
PubMed
Summary
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Cochlear ossification after bacterial meningitis is rapid and can be gross or localized. Gram stain is sensitive for ossification, but high-definition CT scans may be inaccurate if performed within six months of infection.

Area of Science:

  • Otolaryngology
  • Neuroscience
  • Pathology

Background:

  • Bacterial meningitis can lead to cochlear ossification, complicating cochlear implantation.
  • Understanding the pathological processes of cochlear lumen ossification is crucial for surgical planning.

Purpose of the Study:

  • To assess the pathological processes leading to cochlear lumen ossification following bacterial meningitis.
  • To correlate ossification extent with clinical and microbiological factors.

Main Methods:

  • Retrospective case review of profoundly deaf postmeningitic patients undergoing cochlear implantation.
  • Classification of cochlear ossification extent via high-definition computed tomography (CT) and surgical findings.
  • Analysis of correlations between ossification and age at infection, cerebrospinal fluid (CSF) analysis, and time delays.

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Main Results:

  • Ossification presented as gross (scala tympani and vestibuli) or partial (basal turn scala tympani).
  • No significant correlation found between ossification extent and age, pathogen, CSF leukocyte count, or time delay.
  • Gram stain visualization of bacteria was highly sensitive (0.93) but not specific (0.6) for ossification.
  • High-definition CT underestimated ossification in 50% of cases within 6 months post-meningitis.

Conclusions:

  • Cochlear ossification, if present, develops rapidly within months of infection.
  • Gram stain is a sensitive, though not specific, indicator of ossification.
  • High-definition CT may be inaccurate within 6 months of meningitis; imaging should be performed close to surgery.