AQP4 and neuromyelitis optica: Remission. Brain MRI: T2 hyperintense nonenhancing lesions, not fulfilling the 2010 McDonald MRI Criteria for lesion dissemination in time and space. Test for AQP4‐Ab positive. Revised clinical diagnosis, NMO diagnosed. Azathioprine intolerance. Oral Prednisolone introduced, Rituximab considered. EDSS 5.0