Large vestibular aqueduct syndrome

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[edit] Discussion of Large vestibular aqueduct syndrome

  • The vestibular aqueduct is a tubular structure that extends from the posteroinferior surface of the temporal bone to the medial wall of the vestibule and contains the endolymphatic sac.
  • The vestibular aqueduct normally measures less than 1.5 mm in diameter and approximates the size of the posterior semicircular canal, which runs anterior and parallel to the aqueduct.
  • The exact physiologic role of the vestibular aqueduct is not known. However, a dilated vestibular aqueduct has been increasingly recognized as being directly related to sensorineural hearing loss.
  • Large vestibular aqueduct syndrome was present in approximately 12% of children who presented with congenital sensorineural hearing loss.

[edit] Imaging Findings for Large vestibular aqueduct syndrome

  • A dilated vestibular aqueduct can be easily recognized at conventional cross-sectional imaging by identifying its abnormal size in relation to the adjacent posterior semicircular canal.
  • 3D multiplanar reformatted CT images can more clearly demonstrate the classic funnel-shaped deformity of the dilated vestibular aqueduct, which occurs due to an enlarged endolymphatic sac housed within the dorsal vestibular aqueduct.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References for Large vestibular aqueduct syndrome