Abstract
Impairment of gaze holding mechanism and gaze-evoked nystagmus (GEN) in the vertical plane due to a focal brain lesion is usually caused by a failure of the vertical neural integrator, which is known to be localized in the interstitial nucleus of the Cajal in the upper midbrain. We report a patient with hemorrhagic stroke involving the paramedian pontine tegmentum who presented with vertical GEN due to a failure of vertical gaze holding mechanism and unilateral internuclear ophthalmoplegia. The possible structure taking a role as a vertical neural integrator in this patient might be the paramedian tract (PMT) neuron.
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