Before operation, pure-tone audiometry, auditory brainstem response (ABR), compound action potential (CAP), ENG, as well as computed tomoghraphy (CT) and magnetic resonance imaging (MRI) were examined for all the patients.

• 术前接受纯音测听、声阻抗测试、听觉脑干反应(ABR)、复合动作电位(CAP)及眼震电图(ENG)检查,并进行桥小脑角CT及MRI检查。