Magnetic resonance images of Koos grade I to IV vestibular schwannomas

Representative MR images of Koos grades I to IV (A. Koos I, B. Koos II, C. Koos III, D. Koos IV).

MRI: magnetic resonance imaging.

Reproduced with permission from: Erickson NJ, Schmalz PGR, Agee BS, et al. Koos classification of vestibular schwannomas: A reliability study. Neurosurgery 2019; 85(3):409-414. Copyright © 2019 Congress of Neurological Surgeons. https://journals.lww.com/neurosurgery/pages/default.aspx.