MOG and neuromyelitis optica: The association of immunoglobulin G (IgG) autoantibodies directed against myelin oligodendrocyte glycoprotein (MOG) to different disease entities has been discussed1, 2: MOG‐IgG was initially described in multiple sclerosis (MS), neuromyelitis optica spectrum disorders (NMOSD), relapsing inflammatory optic neuritis (RION), acute demyelinating encephalomyelitis (ADEM), or limbic encephalitis.3, 4, 5, 6, 7, 8, 9