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Primary position upbeat nystagmus due to unilateral medial medullary infarction.

Authors
  • Hirose, G
  • Ogasawara, T
  • Shirakawa, T
  • Kawada, J
  • Kataoka, S
  • Yoshioka, A
  • Halmagyi, G M
Type
Published Article
Journal
Annals of neurology
Publication Date
Mar 01, 1998
Volume
43
Issue
3
Pages
403–406
Identifiers
PMID: 9506562
Source
Medline
License
Unknown

Abstract

We report on a patient who developed primary position upbeat nystagmus (ppUBN) due to a unilateral medial medullary infarction. On oculography, the slow phases of the nystagmus sometimes had an exponentially decreasing velocity waveform, indicating that the nystagmus was due to impairment of the vertical position-to-velocity neural integrator. On magnetic resonance imaging, the lesion was caudal to the vestibular nuclei and to the most rostral of the perihypoglossal nuclei, the nucleus intercalatus, a structure that was also involved in a previously reported case of ppUBN due to a unilateral medullary lesion. On the basis of these imaging and oculographic observations, we propose that a unilateral lesion of the nucleus intercalatus is sufficient to cause ppUBN and that the nucleus intercalatus is a part of the vertical position-to-velocity neural integrator in the human ocular-motor system.

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