Koos classification for vestibular schwannomas
Small intracanalicular tumor
Grade 1
Small tumor with protrusion into the cerebellopontine cistern, without contact with the brainstem
Grade 2
Tumor occupying the cerebellopontine cistern with no brainstem displacement
Grade 3
Large tumor with brainstem and cranial nerve displacement
Grade 4
References
Koos Classification of Vestibular Schwannomas: A Reliability Study. Neurosurgery, Volume 85, Issue 3, September 2019, Pages 409–414
doi:
10.1093/neuros/nyy409
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