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Large Vestibular Aqueduct Syndrome:A Report of Two Cases Koutetsu Lee 1,2 1Department of Otolaryngology, Osaka Medical College pp.249-252
Published Date 1998/4/20
DOI https://doi.org/10.11477/mf.1411901748
  • Abstract
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Two patients with large vestibular aqueduct syn-drome (LVAS) were reported. A 11-year-old female developed a sudden hearing impairment in the right ear. She did not complain vertigo. Pure tone audiometry showed a profound sensorineural hearing loss in the right ear more than in the left ear. CT and MRI studies revealed enlargement of the vestibular aqueduct and endolymphatic sac bilaterally, indicating a larger change in the right ear than in the left ear. Despite the treatment with intravenous steroid hormone injection for 16 days,hearing level did not recover. Caloric test showed normal responses in bilateral ears.

The second case was a 22-year-old female with the chief complaint of vertigo. She had a severe deafness since her infancy. A pure-tone audiometry revealed a profound sensorineural hearing loss in both ears. CT and MRI studies demonstrated bilate-ral symmetrical enlargement of the vestibular aque-duct and endolymphatic sac. Normal responses were observed bilaterally in caloric test.

From the experiences in above two cases, we emphasize that CT and MRI are useful to diagnose LVAS in the patients who complained of severe hearing impairment from the infancy, and that the enlarged vestibular aqueduct and endolymphatic sac may relate to the degree of hearing loss.


Copyright © 1998, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1316 印刷版ISSN 0914-3491 医学書院

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