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KMID : 1235520220210010019
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Research in Vestibular Science
2022 Volume.21 No. 1 p.19 ~ p.23
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Dissociated Vertical-Torsional Nystagmus in Vestibular Nucleus Lesion
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Kim Hyun-Sung
Oh Eun-Hye
Choi Jae-Hwan
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Abstract
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Dissociated vertical-torsional nystagmus is a unique form of nystagmus characterized by conjugate torsional but disparate vertical components. It has been mainly reported in internuclear ophthalmoplegia or medial medullary lesion involving the medial longitudinal fasciculus (MLF). The patterns of the nystagmus may be explained by a disruption of vestibulo-ocular reflex pathways from vertical semicircular canal or utriculo-ocular reflex within the MLF, but it is debatable. We described a dissociated upbeat-torsional nystagmus in a patient with vestibular nucleus infarction without involvement of MLF.
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KEYWORD
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Dissociated vertical-torsional nystagmus, Vestibular nucleus infarction, Vestibulo-ocular reflex, Utriculo-ocular reflex
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