VSS is typically persistent after onset, either from as early as a patient can remember, or from a particular day, with only variation by degree over time ( 3). VS is reported to occur in about 3.7% of the population ( 2). Visual snow syndrome (VSS) manifests as that visual disturbance in association with other symptoms, such as palinopsia ( 1). Visual snow (VS) is a neurological disorder typically manifest as a panfield visual disturbance consisting of uncountable small dots that are continuously moving. It further shows evidence of how existing predispositions might be relevant to the development of visual snow, in certain subjects and following specific circumstances. This case provides a description of how visual snow syndrome may be caused by an underlying brain disorder, and highlights the importance of the cerebellum in the pathophysiology of this relatively unknown condition. At 1 and 2 years after experiencing the acute cerebellar infarct, the patient's only neurological sequalae was visual snow. This report is the first description of a case of intermittent visual snow syndrome, which transformed into a persistent form following a posterior circulation stroke due to vertebral artery dissection. Although it is usually a continuous and primary disorder, cases of intermittent visual snow have been described in the literature, as well as rare secondary forms. Visual snow syndrome is a novel neurological condition characterized by a panfield visual disturbance associated with several additional symptoms. 2Department of Neurology, University of California, Los Angeles, Los Angeles, CA, United States.1Headache Group, Wolfson Centre for Age-Related Diseases (CARD), SLaM Biomedical Research Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, National Institute for Health Research (NIHR)-Wellcome Trust King's Clinical Research Facility, King's College Hospital, London, United Kingdom.Francesca Puledda 1 * María Dolores Villar-Martínez 1 Peter J.
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