MOG and neuromyelitis optica: In addition, we evaluated whether and how many MOG-IgG-positive patients with ON and/or myelitis met Wingerchuk’s revised 2006 diagnostic criteria for NMO [28], the new 2015 international diagnostic consensus criteria for NMO spectrum disorders (NMOSD) [29], Barkhof’s MRI criteria for MS, and/or McDonald’s clinicoradiological criteria for MS.