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Eye position and vertical slow phase velocity (SPV) during Dix-Hallpike tests in a subject with a cerebellar arteriovenous malformation. In the upright position, no nystagmus was observed. Dix-Hallpike tests revealed a rapid onset of downbeat nystagmus with either ear down. The nystagmus was persistent, lasting more than one minute, unlike the characteristic nystagmus of canalithiasis.
