Abstract
Presurgical and postsurgical brain stem evoked response audiometry (BERA) examinations were done in patients with tumours of the posterior cranial fossa. A correlation exists between the extent of presurgical BERA-alterations and postsurgical hearing-power and facial nerve function. Small tumours (3 cm). BERA-alterations on the contralateral side point to an additional brain stem compression which can normalize after surgery.