In this issue of Neuroimaging Clinics, guest editors Drs. Frederik Barkhof and Yaou Liu bring their considerable expertise to the topic of Multiple Sclerosis and Associated Demyelinating Disorders. Top experts in the field discuss advanced brain imaging in CNS demyelinating diseases; new imaging markers in MS and related disorders: smoldering inflammation and central vein sign; the use of AI in MS and white matter disease; optic nerve imaging in MS and related disorders; atypical demyelinating disorders; and more. Co-Editor Frederik Barkhof, MD, has received the National Multiple Sclerosis Society and the American Academy of Neurology's 2018 John Dystel Prize for Multiple Sclerosis Research for his many years of outstanding research in the field of MS, especially in advancing the understanding and clinical use of brain imaging. - Contains 12 relevant, practice-oriented topics including diagnostic criteria for MS, NMOSD and MOGAD; routine MRI protocol and standardization in CNS demyelinating diseases; spinal cord imaging in MS and related disorders; treatment monitoring in MS: efficacy and safety; cognitive impairment in MS and related disorders; and more. - Provides in-depth clinical reviews on multiple sclerosis and associated demyelinating disorders, offering actionable insights for clinical practice. - Presents the latest information on this timely, focused topic under the leadership of experienced editors in the field. Authors synthesize and distill the latest research and practice guidelines to create clinically significant, topic-based reviews.