MOG and neuromyelitis optica: Tab: tablet; mg: milligram; MRI: magnetic resonance imaging; NMOSD: neuromyelitis optica spectrum disorder; LFT: liver function test; CNS: central nervous system; IgG: immunoglobulin G; MOG: myelin oligodendrocyte glycoprotein; USG: ultrasonography; CE-MRI: contrast-enhanced magnetic resonance imaging; NMO: neuromyelitis optica; VEP: visual evoked potentials; CSF: cerebrospinal fluid