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Neuromyelitis Optica Spectrum Disorders

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Abstract

Neuromyelitis optica (NMO) is an autoimmune disease that is characterized by antibody-mediated inflammation, demyelination, neuronal loss, and necrosis of the central nervous system (CNS) – most commonly of optic nerves, spinal cord, and brainstem. In 2006, Wingerchuk et al. proposed that the diagnosis of NMO requires a clinical episode of either optic neuritis (ON) or acute myelitis and at least two out of the three following supportive criteria for the diagnosis of NMO: continuous spinal cord lesion encompassing more than three vertebral segments on magnetic resonance imaging (MRI), brain MRI not fulfilling diagnostic criteria for multiple sclerosis (MS), and aquaporin-4 (AQP4) immunoglobulin G seropositivity. In 2015, the diagnostic criteria were once again revised to incorporate other characteristic findings of the disorder including an area postrema syndrome, tumefactive presentations, as well as brainstem, thalamic, and hypothalamic manifestations.

More recently, researchers have expanded the breadth of NMO spectrum disorders, and the identification of the aquaporin-4 (AQP4) antibody has also allowed for B-cell targeting treatments. In this chapter, we will discuss current knowledge about the epidemiology, pathogenesis, diagnosis, treatments, and important ongoing research.

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Galetta, K.M., Matiello, M. (2019). Neuromyelitis Optica Spectrum Disorders. In: Cho, T., Bhattacharyya, S., Helfgott, S. (eds) Neurorheumatology. Springer, Cham. https://doi.org/10.1007/978-3-030-16928-2_19

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