Post-Coronavirus Disease Autoimmunity-associated Morvan's Syndrome

A lot of autoimmune conditions have been found to be associated with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). There are multiple cases of autoimmune and autoinflammatory diseases reported after the coronavirus disease 2019 (COVID-19) pandemic. Autoimmune neurological presentations have also been reported but are very rare. Morvan's syndrome is a life-threatening autoimmune disease and is very rare. Morvan's syndrome is classically characterized by neuromyotonia, dysautonomia, insomnia, and neuropsychiatric symptoms. Leucine-rich glioma-inactivated protein 1 (LGI1) and contactin-associated protein 2 (CASPR2) autoimmunity has also been associated with Morvan's syndrome. We hereby report an interesting case of a male patient in his 40s, who had a history of COVID-19 infection, following which he had bilateral lower-limb weakness and pain, with profuse sweating, and was later diagnosed as a case of SARS-CoV-2-associated Morvan's syndrome.