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Related Experiment Videos

Postmeningitic ossification in pediatric cochlear implantation.

N M Young1, C A Hughes, S E Byrd

  • 1Division of Pediatric Otolaryngology, Children's Memorial Medical Center, and the Department of Otolaryngology-Head and Neck Surgery, Northwestern University Medical School, Chicago, Illinois 60614, USA.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|February 1, 2000
PubMed
Summary

Postmeningitic deafness in children often leads to cochlear ossification, requiring surgical intervention. High-resolution CT scans can predict this ossification, with lateral semicircular canal imaging being more sensitive than cochlear views.

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Area of Science:

  • Otolaryngology
  • Pediatric Radiology
  • Neurosurgery

Background:

  • Meningitis can cause cochlear ossification in pediatric patients.
  • This ossification presents surgical challenges for cochlear implantation.

Purpose of the Study:

  • To retrospectively review high-resolution CT scans (HRCTs) of pediatric cochlear implant recipients post-meningitis.
  • To correlate HRCT findings with surgical observations of ossification.

Main Methods:

  • Retrospective review of HRCTs from 20 pediatric patients (11 months to 12 years) who received multichannel cochlear implants.
  • Correlation of HRCT findings with intraoperative assessment of cochlear and semicircular canal ossification.

Main Results:

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  • Ninety percent of patients required drilling of ossified bone in the basal turn during surgery.
  • HRCT suggested basal turn ossification in 45% of cases (50% sensitivity).
  • HRCT showed lateral semicircular canal ossification in 72% of cases (77% sensitivity).
  • Five of six cases without radiographic ossification had positive surgical findings.

    • Conclusions:

    • Cochlear ossification is frequent in postmeningitic deaf children.
    • HRCT imaging of the lateral semicircular canal is more sensitive for predicting ossification than cochlear HRCT.
    • Negative HRCT findings do not guarantee cochlear patency during implantation.