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Vertical One-and-a-Half SyndromeSupranuclear Downgaze Paralysis With Monocular Elevation Palsy
Dirk Deleu, MD;
Therese Buisseret, MD;
Guy Ebinger, MD
Arch Neurol. 1989;46(12):1361-1363.
Abstract
• A patient with bilateral infarction in the mesodiencephalic region showed impairment of all downward rapid eye movements (including vestibulo-ocular movements) and foveal smooth pursuit (nondissociated downgaze paralysis) associated with monocular paralysis of elevation (vertical one-and-a-half syndrome). Bell's phenomenon and all types of horizontal eye movements were preserved. The lesions may have affected the efferent tracts of the rostral interstitial nucleus of the medial longitudinal fasciculus bilaterally and the premotor fibers to the contralateral superior rectus subnucleus and ipsilateral inferior oblique subnucleus, either before or after decussation in the posterior commissure.
Author Affiliations
From the Departments of Neurology (Drs Deleu and Ebinger) and Neuroradiology (Dr Buisseret), University Hospital, Vrije Universiteit Brussel, Brussels, Belgium.
Footnotes
Accepted for publication February 15, 1989.
Reprint requests to Department of Neurology, University Hospital, Vrije Universiteit Brussel, Laarbeeklaan 101, B-1090 Brussels, Belgium (Dr Deleu).
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