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
Creator Paul Freund, MD, FRCSC; Edward Margolin, MD, FRCSC
Affiliation (PF) University of Toronto, Dept of Ophthalmology & Vision Sciences, Toronto Eye Specialists and Surgeons; (EM) Associate Professor, University of Toronto, Dept of Ophthalmology & Vision Sciences, Toronto Eye Specialists and Surgeons
Subject Dorsal Midbrain Syndrome; Parinaud Syndrome; Convergence-Retraction Nystagmus; Light-Near Dissociation
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.
Date 2019-01
Language eng
Format video/mp4
Type Image/MovingImage
Collection Neuro-Ophthalmology Virtual Education Library: NOVEL https://NOVEL.utah.edu
Publisher North American Neuro-Ophthalmology Society
Holding Institution Spencer S. Eccles Health Sciences Library, University of Utah
Rights Management Copyright 2019. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
ARK ark:/87278/s69d184x
Setname ehsl_novel_novel
ID 1395855
Reference URL https://collections.lib.utah.edu/ark:/87278/s69d184x
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