Tumors are typically described as small (less than 1.5 cm)
Small
Management of small consists of 3 options:
Observation with imaging follow-up
Radiosurgery.
And/or tumor removal.
Koos Grade 1
Data suggest that Koos I patients should be treated early with Gamma Knife radiosurgery (GKS), before tumor growth and/or hearing deterioration, as they have the highest probability of hearing preservation 1).
1)
Levivier M, Tuleasca C, Mercy G, Schiappacasse L, Zeverino M, Maire R. Should
Koos grade I vestibular schwannomas be treated early with gamma knife surgery? A
subgroup analysis in a series of 190 consecutive patients. Neurochirurgie. 2014
Dec;60(6):331. doi: 10.1016/j.neuchi.2014.10.028. Epub 2014 Nov 21. PubMed PMID:
25480195.