下顎部の帯状疱疹に内耳障害のみを伴ったHunt症候群の1例—とくに平衡機能検査の経過を中心に

Herpes Zoster Oticus accompaning with Vertigo:A Case Report

I．はじめに

　耳介および外耳道部の帯状疱疹に顔面神経麻痺と耳鳴，難聴，めまい・平衡障害などを伴った疾患はいわゆる典型的なRamsay Hunt症候群とされている。しかし種々の亜型が存在することが知られており，頻度は少ないが顔面神経麻痺を欠き，耳帯状疱疹に内耳障害のみを伴った症例も報告^1〜5）されている。

　またRamsay Hunt症候群の帯状疱疹は耳領域以外の，三叉神経，舌咽神経，迷走神経，第2,3頸神経領域にも発生しうると報告^6〜8）されている。

A 43-year-old man was suffering from vertigo, disequilibrium, tinnitus, a hearing loss, and had a vesicle formed on his right lower jaw caused by Herpes Zoster virus. During a two-week period he had two vertigenous attacks. After the secondattack, repeated caloric tests using ice water were made but failed to elicit any nystagmus in his right ear. His hearing loss, tinnitus recovered within five months from his first attack. The virus might infiltrate from the trigeminal ganglion to the skin, then to the vestibular nerve via the auricular branch of the vagus nerve and the facial nerve in this case.