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Diagnosing Large Vestibular Aqueduct: Radiological Review of High-Resolution CT Versus High-Resolution Volumetric

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Summary

High-resolution computed tomography (HRCT) and high-resolution volumetric T2-weighted MRI (HRT2-MRI) show high concordance in diagnosing large vestibular aqueduct (LVA). HRCT identified more cases of LVA associated with hearing loss than HRT2-MRI.

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Area of Science:

  • Radiology
  • Neuroimaging
  • Otolaryngology

Background:

  • Large vestibular aqueduct (LVA) is a common inner ear malformation associated with hearing loss.
  • High-resolution computed tomography (HRCT) has been the standard imaging modality for LVA diagnosis.
  • Advancements in magnetic resonance imaging (MRI) technology offer potential for improved LVA detection.

Purpose of the Study:

  • To compare the diagnostic yield of high-resolution volumetric T2-weighted MRI (HRT2-MRI) with HRCT for diagnosing LVA.
  • To evaluate the concordance rate between HRCT and HRT2-MRI in identifying LVA.

Main Methods:

  • A retrospective review of patients diagnosed with LVA between 2002 and 2016 was conducted.
  • Three neuroradiologists independently reviewed HRCT and HRT2-MRI scans from patients with hearing loss.
  • Age-matched controls were included for comparison.

Main Results:

  • The overall concordance rate for LVA diagnosis between HRCT and HRT2-MRI was 88%.
  • HRCT detected LVA in 15 ears where it was not identified on HRT2-MRI, while HRT2-MRI detected LVA in 2 ears not identified on HRCT (p=0.002).
  • Excellent inter-rater reliability was observed among the reviewing radiologists.

Conclusions:

  • Both HRCT and HRT2-MRI demonstrate high efficacy and concordance in diagnosing LVA.
  • HRCT identified a greater number of LVA cases associated with clinically significant hearing loss compared to HRT2-MRI.
  • The choice between HRCT and HRT2-MRI for LVA diagnosis may depend on patient-specific factors and clinical presentation.