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[High resolution computerized tomography of middle ear abnormalities]

R Siegert1, H Weerda, T Mayer

  • 1Klinik für Hals-, Nasen- und Ohrenheilkunde, Medizinischen Universität zu Lübeck.

Laryngo- Rhino- Otologie
|April 1, 1996
PubMed
Summary

This study developed a radiologic score using high-resolution computed tomography to assess malformed petrous bones in patients with microtia and atresia. The score aids in determining the need for middle ear reconstruction versus hearing aids.

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Area of Science:

  • Otolaryngology
  • Radiology
  • Medical Imaging

Background:

  • Malformed petrous bones are often associated with microtia and atresia of the external auditory canal.
  • Accurate assessment of these malformations is crucial for surgical planning.

Purpose of the Study:

  • To analyze malformed petrous bones using computed tomography (CT).
  • To develop a radiologic scoring system to guide the indication for operative middle ear reconstructions.

Main Methods:

  • High-resolution CT scans of 142 petrous bones from 71 patients with unilateral or bilateral microtia and atresia were evaluated.
  • The study focused on identifying and quantifying various malformations within the middle ear structures.

Main Results:

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  • Significant dysplasia of middle ear ossicles (97%), malformed stapes (70%), and occluded oval (32%) or round windows (7%) were observed.
  • Facial nerve canal displacement (75%) and labyrinthine abnormalities (16%) were also noted.
  • No strong correlation was found between auricle malformation and middle ear malformation.

    • Conclusions:

    • High-resolution CT is essential for evaluating malformed middle ears.
    • A proposed radiologic score, based on specific anatomical criteria, can aid in assessing malformed petrous bones.
    • The score helps determine the suitability for middle ear reconstruction versus hearing aid use, with specific thresholds for unilateral and bilateral malformations.