AQP4 and myeloid sarcoma: The association between lower global NAWM-FA and higher fatigue scores is well-known in MS patients,60,61 and in our study, despite AQP4-NMOSD and MOGAD patients showed less diffusion abnormalities in the NAWM17,62 compared to MS patients, the association between cognitive fatigue and NAWM-FA was confirmed even adjusting for the disease group.