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
Subject Downbeat Nystagmus, Jerk Nystagmus, Gaze Evoked Nystagmus, Abnormal Saccades
Creator Daniel R. Gold, DO, Departments of Neurology, Ophthalmology, Neurosurgery, Otolaryngology - Head & Neck Surgery, Emergency Medicine, and Medicine, The Johns Hopkins School of Medicine
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.
Imaging 1, patient with monocular DBN OD and other cerebellar ocular motor signs
Contributor Daniel R. Gold, D.O.
Publisher Spencer S. Eccles Health Sciences Library, University of Utah
Date 2017
Type Image/MovingImage
Format video/mp4
Relation is Part of NOVEL: Neuro-ophthalmology Virtual Education Library Examination Collection
Rights Management Copyright 2017. For further information regarding the rights to this collection, please visit:
Holding Institution Spencer S. Eccles Health Sciences Library, University of Utah, 10 N 1900 E, SLC, UT 84112-5890
Collection Neuro-ophthalmology Virtual Education Library: NOVEL
Language eng
ARK ark:/87278/s64f5dkq
Setname ehsl_novel_gold
Date Created 2017-04-04
Date Modified 2021-05-06
ID 1213439
Reference URL
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