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Diagnostic Protocol for Detecting Otosclerosis on High-Resolution Temporal Bone CT.

Lisa A Brown1, Burce Ozgen Mocan2, Miriam I Redleaf1

  • 1Department of Otolaryngology-Head and Neck Surgery, The University of Illinois at Chicago, USA.

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|July 11, 2019
PubMed
Summary
This summary is machine-generated.

A new checklist for high-resolution computed tomography (HRCT) accurately diagnoses otosclerosis (OS). This systematic protocol aids in surgical planning and patient counseling by improving diagnostic confidence on temporal bone imaging.

Keywords:
fissula ante fenestramhigh-resolution computed tomographymiddle earotosclerosisstapes

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Area of Science:

  • Radiology
  • Otolaryngology
  • Medical Imaging

Background:

  • Otosclerosis (OS) is a common cause of conductive hearing loss.
  • Accurate diagnosis of OS on temporal bone imaging is crucial for surgical planning.
  • High-resolution computed tomography (HRCT) is a key imaging modality for evaluating OS.

Purpose of the Study:

  • To introduce a systematic checklist for diagnosing otosclerosis (OS) on HRCT.
  • To evaluate the efficacy of this HRCT protocol in identifying OS.

Main Methods:

  • Retrospective case series of 17 ears with surgically confirmed OS and 21 control ears.
  • Evaluation of preoperative HRCTs by a single neuroradiologist using a systematic protocol.
  • Protocol focused on fissula ante fenestram and pericochlear lucency, and new bone formation.

Main Results:

  • The protocol achieved 100% accuracy in diagnosing OS (17/17 test ears) and ruling out OS (21/21 control ears).
  • Lucency at the fissula ante fenestram was present in all OS cases (17/17).
  • New bone formation and cochlear lucency were observed in 53% and 47% of OS cases, respectively.

Conclusions:

  • The developed HRCT checklist is a highly accurate tool for diagnosing otosclerosis.
  • Systematic review of HRCT images enhances diagnostic confidence.
  • Preoperative imaging facilitates patient counseling, surgical preparation, and exclusion of other pathologies.