Large vestibular aqueduct syndrome
 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.
 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.
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 References for Large vestibular aqueduct syndrome
- Girish M. Fatterpekar, Amish H. Doshi, Mohit Dugar, Bradley N. Delman, Thomas P. Naidich, and Peter M. Som. Role of 3D CT in the Evaluation of the Temporal Bone. RadioGraphics 2006 26: S117-132S.