Abstract

Clinically mild encephalitis/encephalopathy with reversible splenial lesions (MERS) is a mild form of encephalitis/encephalopathy that appears in association with various conditions, including infection. COVID-19 is also known to cause MERS. MERS more commonly occurs in children, and adult cases are relatively rare. Typical head MRI findings include a round lesion in the mid-layer of the corpus callosum with a high signal intensity on diffusion-weighted images. Most improve within a week. Although the exact mechanism by which the cerebral corpus callosum is affected is still unknown, several hypotheses have been proposed, including the involvement of electrolyte abnormalities (e.g., hyponatremia) and inflammatory cytokines (e.g., IL-6). In this report, we describe the first case of COVID-associated MERS with a typical imaging course and hyponatremia, with a review of the relevant literature. When psychiatric symptoms and the disturbance of consciousness appear in COVID patients, MERS should be considered in addition to delirium due to fever and hypoxia.

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