2.3 MRI images
Brain MRI scans were performed in all patients with sequences including axial T1, axial T2, sagittal T2 fluid-attenuated inversion recovery (FLAIR), diffusion-weighted images, and contrast-enhanced axial T1 images. Optic nerve MRI was performed in five patients (pats 1–2, 4, 9–10), and spinal cord MRI was performed in five patients (pats 3–5, 9–10).