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[Computed tomography findings in middle ear anomaly]

S Masuda1, K Kodera, Y Iino

  • 1Department of Otolaryngology, Teikyo University School of Medicine, Tokyo.

Nihon Jibiinkoka Gakkai Kaiho
|February 1, 1994
PubMed
Summary

Computed tomography (CT) effectively diagnoses middle ear anomalies like incudo-stapedial joint separation and stapes fixation. This imaging technique aids in differentiating these conditions when the tympanic membrane appears normal.

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Area of Science:

  • Otolaryngology
  • Radiology
  • Medical Imaging

Background:

  • Middle ear anomalies can present with normal tympanic membranes, complicating diagnosis.
  • Accurate imaging is crucial for identifying specific pathologies affecting the ossicular chain.

Purpose of the Study:

  • To evaluate the diagnostic efficacy of computed tomography (CT) of the temporal bone.
  • To assess CT's ability to detect middle ear anomalies, specifically incudo-stapedial joint separation and stapes fixation.

Main Methods:

  • Retrospective analysis of 45 temporal bone CT scans from patients with middle ear anomalies and normal tympanic membranes.
  • Comparison with 40 CT scans from a normal control group.
  • Radiological diagnoses performed by four independent otorhinolaryngologists.

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Main Results:

  • CT correctly diagnosed incudo-stapedial joint separation in 77.8% of cases.
  • CT correctly diagnosed stapes fixation in 75.6% of cases.
  • The monopedal stapes was not visualized; malleus and incus fixation were not reliably diagnosed.

Conclusions:

  • Computed tomography of the temporal bone is clinically valuable for diagnosing incudo-stapedial joint separation and stapes fixation.
  • CT can differentiate these specific middle ear pathologies even with normal tympanic membranes.