Miller-Fisher Syndrome Presenting as Facial Diplegia With COVID-19 Co-Infection.

Coronavirus disease 2019 (COVID-19) has reportedly been associated with various neurological manifestations, including unilateral facial palsy and, very rarely, facial diplegia. We present a unique case of Miller-Fisher Syndrome (MFS), a variant of Guillain-Barré Syndrome (GBS) that was noted in conjunction with a COVID-19 infection. In this case, a patient presented with bilateral facial palsy, dysarthria, right-sided hemiparesis, ataxia, and the confirmation of SARS-CoV-2 infection. His computed tomography (CT) scan of the brain and serology test results did not support alternate etiologies for facial palsy. His cerebrospinal fluid (CSF) studies demonstrated albuminocytologic dissociation, which was consistent with the diagnosis of MFS and further supported by his ataxia and ophthalmoplegia. A five-day course of intravenous immunoglobulin (IVIG) therapy combined with physical, occupational, and speech therapy improved his recovery.