Prognostic factors for postsurgical hearing and facial nerve function in cases of cerebellopontine angle-tumours. The meaning of brain stem evoked response audiometry (BERA).
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 (less than 1 cm) correlate generally with small BERA-alterations and show a good prognosis. Conservation of hearing in cases of larger tumours can only be expected when BERA-alterations are small. Prognosis is generally bad in cases of big tumours (greater than 3 cm). BERA-alterations on the contralateral side point to an additional brain stem compression which can normalize after surgery.
D001299:Audiometry; D001932:Brain Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery*; D001933:Brain Stem / Q000502:physiology*; D002528:Cerebellar Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery*; D003388:Cranial Fossa, Posterior; D003638:Deafness / Q000209:etiology / Q000601:surgery; D005071:Evoked Potentials; D005154:Facial Nerve / Q000502:physiology*; D005260:Female; D006309:Hearing / Q000502:physiology; D006801:Humans; D008297:Male; D008579:Meningioma / Q000000981:diagnostic imaging / Q000601:surgery; D008875:Middle Aged; D009463:Neuroma / Q000000981:diagnostic imaging / Q000601:surgery; D011149:Pons / Q000000981:diagnostic imaging / Q000601:surgery*; D011379:Prognosis; D014057:Tomography, X-Ray Computed