Supplementary Material for: A Rare Case of Coronavirus Disease 2019 Encephalitis Mimicking Creutzfeldt–Jacob Disease in an Immunocompromised Patient: A Case Report

COVID Encephalitis Mimicking Creutzfeldt-Jacob Disease
Naveenkumar Nallathambi, Junior resident, Institute of Internal Medicine, Madras Medical College, India

Introduction: Coronavirus disease 2019 (COVID-19) encephalitis is characterized by viral entry into the brain, resulting in inflammation and a cascade of neuronal damage. Clinical manifestations include headaches, seizures, and movement disorders. A mortality rate of 20% and infrequent presentation make COVID-19 encephalitis a diagnostic challenge.

Case Presentation: We hereby present the case of a 55-year-old man with a history of diabetes mellitus presenting with altered sensorium, swelling in the left eye and involuntary jerky limb movements. Neurological examination revealed neck rigidity, myoclonic jerks, and an extensor plantar response. Brain magnetic resonance imaging (MRI) was performed, which revealed cortical enhancement in the bifrontal, temporal, and occipital lobes. Rapid progression of myoclonus, altered sensorium, and cortical enhancement on MRI suggested Creutzfeldt–Jacob Disease. After a thorough workup, the diagnosis was COVID-19 encephalitis with rhino-orbital mucormycosis. The treatment regimen consisted of adequate glycemic control, remdesivir injection, intravenous and retroorbital liposomal amphotericin, and levetiracetam. The patient’s condition improved and he was eventually discharged.

Conclusion: This case illustrates the uncommon presentation of COVID-19 with neurological involvement and emphasizes the value of history-taking, neuroimaging, and CSF analysis. A high index of suspicion is critical for a prompt diagnosis and initiating therapy.