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Enhancement within the vestibular aqueduct is a normal finding on MRI, appearing more frequently and intensely on 3D-FLAIR sequences compared to T1-weighted images. Radiologists should not mistake this expected enhancement for pathology unless other concerning signs are present.

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Area of Science:

  • Neuroradiology
  • Medical Imaging
  • Anatomy

Background:

  • The normal appearance of the vestibular aqueduct on postcontrast MRI is not well-documented.
  • Characterizing normal enhancement patterns is crucial for accurate interpretation.

Purpose of the Study:

  • To define the typical enhancement patterns of the vestibular aqueduct on postcontrast MRI.
  • To compare enhancement characteristics on 3D fast spin-echo T1 (3D FSE T1) and 3D fluid-attenuated inversion recovery (3D-FLAIR) sequences.

Main Methods:

  • Retrospective review of 95 internal auditory canal MRI examinations.
  • Inclusion of high-resolution pre- and postgadolinium 3D FSE T1 and postgadolinium 3D-FLAIR sequences.
  • Independent assessment of vestibular aqueduct enhancement by two neuroradiologists.

Main Results:

  • Enhancement was observed more frequently on postgadolinium 3D-FLAIR (42.2%) than on T1-weighted images (21.6%).
  • Enhancement intensity was significantly greater on 3D-FLAIR compared to T1-weighted sequences.
  • No significant difference in the prevalence of enlarged vestibular aqueduct was noted.

Conclusions:

  • Vestibular aqueduct enhancement is a normal finding on postcontrast MRI.
  • Enhancement is more common and intense on 3D-FLAIR sequences.
  • This enhancement should not be misinterpreted as pathology without other suspicious findings.