MOG and myeloid sarcoma: The other anatomical compartments include pathological entities that can involve the whole CNS such as MS, MOG-antibody-associated disorder (MOGAD), and Neuromyelitis Optic Spectrum Disorders (NMOSDs) (i.e., the “brain” compartment) and systemic diseases, which can affect other organs outside of the CNS (the “whole body” compartment).