Reversible Vestibular Nerve Dysfunction in a Case with a Giant Chondrosarcoma Occupying the Cerebellopontine Angle

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  • Fujiwara Keishi
    Department of Otolaryngology-Head & Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University
  • Yamaguchi Shigeru
    Department of Neurosurgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University
  • Motegi Hiroaki
    Department of Neurosurgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University
  • Fujiwara Yuuki
    Department of Otolaryngology-Head & Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University
  • Homma Akihiro
    Department of Otolaryngology-Head & Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University

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  • vHIT, VEMP を用いて手術による前庭機能改善を評価し得た小脳橋角部を占拠する錐体斜台部巨大軟骨肉腫の1例
  • vHIT,VEMP オ モチイテ シュジュツ ニ ヨル ゼンテイ キノウ カイゼン オ ヒョウカ シエタ ショウノウバシ カドブ オ センキョ スル スイタイ シャダイブ キョダイ ナンコツニクシュ ノ 1レイ

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Abstract

<p>　Vestibular nerve dysfunction is one of the most common neuropathies observed in patients with cerebellopontine angle tumors. The video Head Impulse Test (vHIT) and vestibular-evoked myogenic potential (VEMP) have made it possible to evaluate the function of the inferior vestibular nerve. A 22-year-old male patient was referred to our department for preoperative evaluation of a giant chondrosarcoma occupying the left cerebellopontine angle. Preoperative vHIT and VEMP revealed dysfunction of all the semicircular canals and otoliths on the affected side, suggesting impairment of both the superior and inferior vestibular nerves. Postoperatively, the vHIT and VEMP on the affected side showed improvement, confirming that surgery had improved the superior and inferior vestibular nerve dysfunction. In cerebellopontine angle tumors other than vestibular schwannomas, improvement of vestibular nerve dysfunction may be observed after decompression by surgery. The vHIT and VEMP are useful in assessing function of the superior and inferior vestibular nerves before and after surgery.</p>

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