A Patient With Myelin Oligodendrocyte Glycoprotein Positive Encephalitis With Ring Enhancing Lesions on Magnetic Resonance Imaging (MRI) After COVID-19 Exposure.

Myelin oligodendrocyte glycoprotein (MOG) antibody has been associated with a wide range of neurological diseases, from neuromyelitis optica spectrum disorder to acute disseminated encephalomyelitis. However, MOG positivity with isolated encephalitis has been infrequently reported. MRI findings are usually of the demyelination type. In this case, we report on a patient with COVID-19 exposure who presented with altered mental status and multiple ring-enhancing lesions on MRI mimicking metastatic disease. Due to his unusual MRI findings and presentation, the correct diagnosis was not apparent until MOG antibody results came back positive.