Bozhkov et al reported predictors of preserved hearing after surgery for vestibular schwannoma. These can help to identify a patient with a better prognosis. The authors are from University Hospital Erlangen in Germany and the Medical University Vienna.
Patient selection: patient undergoing surgery for vestibular schwannoma.
Parameters:
(1) size of the tumor in mm (starting at internal auditory canal and extending to the cerebellopontine angle) using the Erlangen grading system
(2) anatomic extension, using the Koos grading system
Erlangen Grade
Size
Hearing Preservation
1
< 12 mm
83%
2
12 to 25 mm
30%
3
> 25 mm
5%
Koos Grade
Location
Hearing Preservation
1
intrameatal
100%
2
intracisternal without brainstem contact
36%
3
intracisternal with brainstem contact
23%
4
brainstem compression
22%
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