AQP4 and myeloid sarcoma: Lesions in the brain constituted mainly nonspecific white matter lesions (6 patients [43%]); the other lesions included 1 patient (7%) with cerebellar lesions, 2 patients (14%) with callosal lesions, and 1 patient (7%) with MS-like lesions (ie, periventricular white matter lesions), and the remaining 4 patients (29%) had inflammatory lesions typical for NMOSD associated with AQP4-Ab disease.