小脳橋角部動脈瘤と難聴

Aneurysm in the Cerebello-pontine Angle and Hearing Loss

I．症例1

　患者：48歳　男子

　現病歴：8年前（1970年），急に周囲の景色が左から右に流れてみえ，嘔気・嘔吐・蝉のなくような耳鳴を伴った．これは約1時間つづいたが，この間右耳が全く聞えなかったという．

Ishemic etiology for manifestation of the episodic hearing loss observed in our two patients with aneurysm in the cerebello-pontine angle was discussed. An analysis was also made in the responsive area for contribution to hearing loss with an aid of electrical response audiometry (ERA).

The first case was a 48-year-old man with aneurysm located in the right anterior inferior cerebellar artery at the internal auditory meatus. This case was of interest because of its rarity in location, but also of the unusual course of the symptoms.