MOG and acute disseminated encephalomyelitis: However, in a study conducted in 2015 (Baumann et al., 2015), the distribution range of MRI lesions in MOG-seropositive ADEM was wider (P = 0.035), and ADEM children without MOG-abs were more likely to have well-defined atypical lesions (P = 0.008) and showed more atypical MRI features (P = 0.003).