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  • Title: Episodic vertical oscillopsia and downbeat nystagmus in a Chiari malformation.
    Author: Yee RD, Baloh RW, Honrubia V.
    Journal: Arch Ophthalmol; 1984 May; 102(5):723-5. PubMed ID: 6721763.
    Abstract:
    A 36-year-old woman had intermittent downbeat nystagmus. Between episodes of downbeat nystagmus, eye movements were normal, except for stationary positional nystagmus and decreased vestibulo-ocular responses (VOR) to rotation. Smooth pursuit, optokinetic nystagmus, and visual-VOR interactions, which are usually impaired in patients with downbeat nystagmus and cerebellar dysfunction, were normal. Computed tomography and findings during a suboccipital craniotomy demonstrated a mild Chiari malformation, type 1. Episodic downbeat nystagmus that is not associated with other ocular motor abnormalities due to cerebellar dysfunction can be an initial sign of a Chiari malformation.
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