In the final episode of this three-part series, Dr. Jeff Lambe addresses practical considerations surrounding the inclusion of the optic nerve as a topography for demonstrating dissemination in space. 

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Montalban X, Lebrun-Frénay C, Oh J, et al. Diagnosis of multiple sclerosis: 2024 revisions of the McDonald criteria. Lancet Neurol. 2025;24(10):850-865. doi:10.1016/S1474-4422(25)00270-4