OMG and Alzheimer disease: Cases of simultaneous occurrence of myelin oligodendrocyte glycoprotein antibody (MOG-Ab) and anti-N-methyl-D-aspartate receptor encephalitis (anti-NMDARe) antibody (anti-NMDARe-Ab) are rarely reported and could be mistaken for overlapping MOG-antibody disease (MOG-AD) and NMDARe (one of the antibodies may just be a bystander).