[Isolated facial diplegia as an atypical variant of Guillain-Barre syndrome after suspected SARS-CoV-2 infection]

Introduction: Since the SARS-CoV-2 pandemics began, multiple cases of Guillain-Barre syndrome secondary to COVID-19 have been described. Its typical presentation consists of the triad of paresthesia, ascending muscle weakness and areflexia, although there are several regional variants such as facial diplegia. Case presentation: Two weeks after a contact with a confirmed case of COVID-19, a 35-year-old woman presents with viral myopericarditis. Laboratory studies for autoimmune diseases come back negative, as well as multiple viral serologies. She presents anti-SARS-CoV-2 IgG, with negative PCR. A week after discharge she presents with palsy of both facial nerves, without other neurological abnormalities. She undergoes examination with cranial CT without findings, and an EMG which shows bilateral alteration of facial nerves. She refuses the performance of a lumbar puncture. Discussion: Facial diplegia can occur because of several illnesses, such as meningeal or brainstem tumors, infectious agents, Guillain-Barre syndrome, autoimmune diseases, trauma, metabolic causes or congenital causes. In our patient, having discarded other etiologies with imaging and analytical studies, the most probable cause is the Guillain-Barre syndrome. It is possibly secondary to SARS-CoV-2 infection given the presence of anti-SARS-CoV-2 IgG antibodies after contact with a confirmed case. Conclusion: This case supports the hypothesis that COVID-19 may trigger the Guillain-Barre syndrome, specifically as facial diplegia, which is an atypical variant that should be known to be early diagnosed and treated as part of this syndrome.