Summary
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 (<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 (>3 cm). BERA-alterations on the contralateral side point to an additional brain stem compression which can normalize after surgery.
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Lenarz, T., Sachsenheimer, W. Prognostic factors for postsurgical hearing and facial nerve function in cases of cerebellopontine angle-tumours. Acta neurochir 78, 21–27 (1985). https://doi.org/10.1007/BF01809236
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DOI: https://doi.org/10.1007/BF01809236