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• W4367302926 abstract "<h3>Objective:</h3> To describe a case of recurrent transient global amnesia (TGA) with temporally spaced bilateral hippocampal restricted diffusion on MRI. <h3>Background:</h3> TGA is defined as a sudden onset of anterograde and retrograde amnesia that lasts 24 hours, and can recur over time. Multiple mechanisms have been proposed to explain this condition, including cortical spreading depression, venous congestion, hypoxic-ischemic events, epileptic phenomena, and ineffective connectivity in bilateral hippocampal structures (subiculum-fimbria, entorhinal cortex-CA4) due to vascular impairment. Bilateral hippocampal involvement has been described in the setting of TGA with focal mesial hippocampal diffusion restriction in diffusion-weighted imaging (DWI). Herein we postulate that recurrent TGA results from neuroanatomical network and vascular supply impairment. <h3>Design/Methods:</h3> Retrospectively chart review of a patient with recurrent TGA. <h3>Results:</h3> A 59-year woman with history of head injury in her 30s, migraine, B12 deficiency, benign paroxysmal positional vertigo, degenerative spine disease, post-traumatic stress disorder, and tobacco use, presented with typical symptoms of TGA. Brain MRI demonstrated punctate restricted diffusion in the right hippocampus. A repeat MRI sixteen months after showed complete resolution in DWI. The patient presented with a second similar episode twelve months later; MRI demonstrated punctate lesions in DWI in the left hippocampus. The patient had a negative evaluation for stroke and epilepsy. Of note the patient did report a migraine during each episode. <h3>Conclusions:</h3> To our knowledge, this is the first reported case of recurrent TGA in which there is temporally spaced bilateral hippocampal restricted diffusion on MRI. Our case report aligns with recent theories that recurrent TGA might be related to neuroanatomical network and vascular supply impairment rather than an isolated lesional defect. <b>Disclosure:</b> Dr. Mora Munoz has nothing to disclose. Dr. McKee has nothing to disclose. Dr. Buletko has nothing to disclose. Dr. Mays has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Dynamed Plus (EBSCO Industries, Inc.). Dr. Mays has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for CoolTech Medical. Dr. Mays has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biodelivery Science International. Dr. Mays has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Amgen. Dr. Mays has received personal compensation in the range of $10,000-$49,999 for serving on a Speakers Bureau for Abbvie. Dr. Mays has received personal compensation in the range of $500-$4,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for DynaMed Plus ." @default.
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• W4367302926 date "2023-04-25" @default.
• W4367302926 modified "2023-09-27" @default.
• W4367302926 title "Recurrent Transient Global Amnesia with Contralateral Hippocampal Restricted Diffusion MRI Changes: A Case Report (P4-4.001)" @default.
• W4367302926 doi "https://doi.org/10.1212/wnl.0000000000203840" @default.
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