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Temporal bone imaging for cochlear implantation

D A Seidman1, P M Chute, S Parisier

  • 1Department of Otolaryngology, Manhattan Eye, Ear & Throat Hospital, New York, N.Y.

The Laryngoscope
|May 1, 1994
PubMed
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Computerized tomography (CT) scans are useful for cochlear implantation evaluations but have limitations. CT imaging detected cochlear ossification in only 78% of patients, with 22% showing unexpected bony obstruction during surgery.

Area of Science:

  • Otolaryngology
  • Radiology
  • Neurosurgery

Background:

  • Cochlear implantation requires detailed imaging of inner ear structures.
  • Assessing cochlear ossification is crucial for surgical planning and success.
  • Computerized tomography (CT) is commonly used for pre-operative evaluation.

Purpose of the Study:

  • To evaluate the accuracy of CT scans in detecting cochlear ossification before cochlear implantation.
  • To compare CT findings with intraoperative observations of the cochlea.
  • To determine the incidence of missed cochlear ossification on CT scans.

Main Methods:

  • Retrospective analysis of 104 cochlear implant patient records.
  • Review of patient charts, operative reports, and CT scans.

Related Experiment Videos

  • Comparison of radiographic findings with surgical outcomes regarding cochlear ossification.

    • Main Results:

    • CT scans agreed with operative findings in 78% of cases.
    • 22% of patients had ossification at surgery not detected by CT.
    • In postmeningitic hearing loss cases, CT accuracy for ossification was 53%, with 69% having some ossification.
    • Magnetic resonance imaging (MRI) identified a patent cochlea missed by CT in one case.

    Conclusions:

    • CT imaging has limitations in detecting cochlear ossification, with a significant rate of missed findings.
    • Otologists should anticipate potential bony obstruction even with normal CT scans, especially in cases of postmeningitic hearing loss.
    • Cochlear implantation remains a viable option despite potential intraoperative challenges due to ossification.