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Randolph S. Marshall, MD; Ralph L. Sacco, MD; Ronald Kreuger, MD; Jeffrey G. Odel, MD; J. P. Mohr, MD

Arch Neurol. 1991;48(12):1304-1305.

Abstract
• We describe a patient with a dissociated vertical nystagmus and an internuclear ophthalmoplegia. The vertical nystagmus consisted of a left downward nystagmus with a synchronous right intorting nystagmus when the patient looked down and to the left. This rare type of nystagmus has been described both in isolation and in association with an internuclear ophthalmoplegia. Previous authors postulated a lesion in the midbrain in the region of the medial longitudinal fasciculus. In our patient, a discrete midbrain infarction was demonstrated on magnetic resonance imaging in the hypothesized location, thus providing supportive anatomical evidence for a vertical gaze coordination pathway in the region of the medial longitudinal fasciculus.

Author Affiliations
From the Departments of Neurology (Drs Marshall, Sacco, and Mohr) and Ophthalmology (Drs Kreuger and Odel), Columbia-Presbyterian Medical Center, New York, NY.

Footnotes
Accepted for publication June 4, 1991.

Reprint requests to Neurological Institute of the Columbia-Presbyterian Medical Center, 710 W 168th St, Box 83, New York, NY 10032 (Dr Marshall).

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