양측 외사시핵간안근마비에서 보인 상향안진

초록

A 54-year-old man presented with primary position upbeat nystagmus andwall-eyed bilateral internuclear ophthalmoplegia. He also showed bilateral limbataxia and impaired horizontal gaze. Upbeat nystagmus obeyed Alexander’s lawand attenuated by visual fixation and disappeared by convergence. Brain magneticresonance imaging showed acute infarction in the bilateral paramedian midbraininvolving the crossing of brachium conjunctivum. Multiple mechanisms includingthe interruption of central vestibulo-ocular projections from anterior canal maybe postulated in upbeat nystagmus of this patient.

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