Monocular Downbeat Nystagmus Due to a Posterior Fossa Cyst

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Identifier Monocular_DBN_due_to_cerebellar_tumor
Title Monocular Downbeat Nystagmus Due to a Posterior Fossa Cyst
Creator Daniel R. Gold, DO
Affiliation (DRG) Departments of Neurology, Ophthalmology, Neurosurgery, Otolaryngology - Head & Neck Surgery, Emergency Medicine, and Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland
Subject Downbeat Nystagmus; Jerk Nystagmus; Gaze Evoked Nystagmus; Abnormal Saccades
Description This is a 40-yo-man who experienced months of imbalance and was found to have an epidermoid cyst (immediately posterior to the 4th ventricle), which was resected. Months after surgery, he experienced monocular vertical oscillopsia. On examination, there was subtle downbeat nystagmus (DBN) in the right eye only - none was seen OS, even with ophthalmoscopy. There was no palatal tremor. With convergence, DBN OD increased, and subtle DBN OS was provoked. Additionally, he had gaze-evoked nystagmus and hypermetric saccades in addition to mild gait ataxia. Although monocular DBN has most commonly been reported due to lesions affecting the midbrain or mesodiencephalon, it has been proposed that the cerebellar flocculus has regions that are responsible for monocular control. It is therefore possible that specific damage to one of these monocular areas could cause spontaneous monocular DBN, as in our case.Balaban CD, Watanabe E. Functional representation of eye movements in the flocculus of monkeys (Macaca fuscata). Neurosci Lett. 1984 Aug 24;49(1-2):199-205.
Date 2017
Language eng
Format video/mp4
Type Image/MovingImage
Collection Neuro-Ophthalmology Virtual Education Library: Dan Gold Collection: https://novel.utah.edu/Gold/
Publisher North American Neuro-Ophthalmology Society
Holding Institution Spencer S. Eccles Health Sciences Library, University of Utah
Rights Management Copyright 2016. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
ARK ark:/87278/s64f5dkq
Setname ehsl_novel_gold
ID 1213439
Reference URL https://collections.lib.utah.edu/ark:/87278/s64f5dkq
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