Autoimmune cortical encephalitis in two children with anti-myelin oligodendrocyte glycoprotein (MOG) antibody.

Abstract

Anti-myelin oligodendrocyte glycoprotein antibodies (anti-MOG), directed against a component of the myelin sheath, are sometimes detected in the blood or cerebrospinal fluid (CSF) of patients with acute demyelinating conditions. Cortical encephalitic presentations in anti-MOG-antibody-positive patients are recognized but rare, and few pediatric cases have been described. We describe clinical, biochemical, and MRI findings in two children presenting with generalized seizures due to cortical encephalitis, and review potential underlying immunological processes. In both patients, anti-MOG antibodies were detected. Both underwent MRI scans which demonstrated bilateral cortical swelling and T2/fluid-attenuated inversion recovery (FLAIR) hyperintensity with corresponding regions of reduced diffusion. Early detection of anti-MOG antibodies in patients with a similar presentation and imaging features would enable rapid institution of appropriate treatment, and potentially reduce the need for invasive diagnostic procedures such as brain biopsy.