Clinicopathologic Correlates: Progressive Downbeat Nystagmus in Spinocerebellar Ataxia Type 27B
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A 61-year-old woman presented with episodic dizziness that met diagnostic criteria for vestibular migraine. Vestibular and ocular motor examination was normal, aside from a 1°/second downbeat nystagmus (DBN) that was only seen with removal of fixation (in the... ...