MRIで迷路内神経鞘腫と診断した感音難聴例

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  • A Case of Intralabyrinthine Schwannoma with Unilateral Hearing Loss Diagnosed Using Magnetic Resonance Imaging
  • MRI デ メイロ ナイ シンケイ サヤ シュ ト シンダン シタ カンオン ナンチョウレイ

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<p>We report a case of inner ear intralabyrinthine schwannoma diagnosed using magnetic resonance imaging (MRI). A 60-year-old woman complained of a right hearing loss that had occurred suddenly 2 months earlier. Pure tone audiometry showed scale-out for the right ear and 11.3 dB for the left ear. T1-weighted MRI showed a slightly higher signal intensity than that of normal intralabyrinthine fluid in the vestibule and lateral semicircular canal. The lesion was strongly and sharply enhanced after the intravenous administration of gadolinium. A sharply delineated signal intensity loss was also seen for the same lesion on a T2-weighted MRI examination. A follow-up MRI examination performed 4 years later showed no changes from the initial images. Her hearing level also did not change, and she did not experience vertigo during the 4-year follow-up period.</p>

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