Radial linear perivascular emphasis in coronavirus disease 2019-associated acute disseminated encephalomyelitis.

A 62-year-old woman with coronavirus disease (COVID-19) developed coma on day 19 after her pneumonia was ameliorated. Brain magnetic resonance imaging with gadolinium showed radial linear perivascular enhancement, typically seen in glial fibrillary acidic protein (GFAP) astrocytopathy, although anti-GFAP antibody results were negative. Her consciousness recovered with high-dose steroid administration. We diagnosed the patient with COVID-19-associated acute disseminated encephalomyelopathy (ADEM) with radial linear perivascular emphasis.