Management of unilateral sporadic vestibular schwannoma in adults

IAC: internal auditory canal; MRI: magnetic resonance imaging; SRS: stereotactic radiosurgery; SRT: stereotactic radiotherapy.

* Across various studies in mostly Koos grade I and II tumors, approximately 50% of patients who are observed will progress to treatment within 5 years. Rate of change during observation may be more predictive of risk of hearing loss than absolute tumor size. Patients with an untreated vestibular schwannoma selected for watchful waiting should be followed regularly (at least annually) with both brain MRI and audiometry (for those with serviceable hearing). In general, treatment of symptomatic tumors does not reverse existing symptoms.