Convergence-Retraction Nystagmus in Dorsal-Midbrain Syndrome

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Identifier Convergence-Retraction_Nystagmus_in_Dorsal-Midbrain_Syndrome
Title Convergence-Retraction Nystagmus in Dorsal-Midbrain Syndrome
Subject Dorsal Midbrain Syndrome, Parinaud Syndrome, Convergence-Retraction Nystagmus, Light-Near Dissociation
Creator Paul Freund, MD, FRCSC, University of Toronto, Dept of Ophthalmology & Vision Sciences, Toronto Eye Specialists and Surgeons; Edward Margolin, MD, FRCSC, Associate Professor, University of Toronto, Dept of Ophthalmology & Vision Sciences, Toronto Eye Specialists and Surgeons
Description A man in his early twenties was referred by optometrist for abnormal eye motility findings. He had a remote history of an excised pinealoma. On exam he had almost complete upgaze palsy, convergence-retraction nystagmus on attempted upgaze, and light-near dissociation of pupillary reaction, the classic triad seen in dorsal-midbrain (Parinaud) syndrome. Upgaze palsy occurs presumably because of the lesion affecting vertical gaze centers located in dorsal midbrain (riMLF). Globe retraction is best visible from the side and is likely secondary to co-contraction of lateral and medial recti on attempted upgaze. Pupillary light-near dissociation is presumably secondary to compression of Edinger-Westfall nuclei with sparing of the more ventral near-response nuclei.
Publisher Spencer S. Eccles Health Sciences Library, University of Utah
Date 2019-01
Format video/mp4
Rights Management Copyright 2019. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
Language eng
ARK ark:/87278/s69d184x
Setname ehsl_novel_novel
Date Created 2019-01-11
Date Modified 2019-02-21
ID 1395855
Reference URL https://collections.lib.utah.edu/ark:/87278/s69d184x
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