A case of Meniere's disease with an enlarged internal auditory meatus.

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A 41-year-old male had been suffering for 5 years from hearing loss and tinnitus on the right side accompanied by rotatory vertigo. Tomography revealed an enlarged intenrnal auditory meatus on the right side, with a vertical diameter of 12mm. The vertical diameter on the left side was 8mm. The tentative diagnosis was either Meniere's disease or acoustic neurinoma. Acoustic neurinoma was later ruled out by Air-CT cysternography, which showed normal air filling and no tumor in the right internal auditory meatus. We concluded that the enlarged internal auditory meatus of this patient was a normal variant.<BR>Clinicians must be aware of normal variations in the size of the internal auditory meatus in order to avoid misdiagnosis of acoustic neurinoma.
一般社団法人日本めまい平衡医学会の論文