Claim: Bruns nystagmus is an unusual type of bilateral nystagmus (a condition of involuntary or voluntary eye movement) most commonly occurring in 11% of patients with vestibular schwannoma, and occurs mainly in patients with larger tumours (67% of patients with tumours over 3.5 cm diameter).
Evidence: Bruns nystagmus is an unusual type of bilateral nystagmus most commonly occurring in patients with cerebellopontine angle tumours.