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Figure 1: Neuromyelitis optica spectrum disorders (NMOSDs): (a) gadolinium-enhanced T1-weighted magnetic resonance imaging (MRI) of optic nerve showing thickened and enhancing optic nerves (blue arrows); (b) thickened and enhancing optic chiasma on gadolinium-enhanced T1-weighted images (blue arrows); (c) longitudinally extensive cord lesion on T2-weighted sagittal images (blue arrows), and (d) brainstem lesion on T2-weighted sagittal images (blue arrows)

Figure 1: Neuromyelitis optica spectrum disorders (NMOSDs): (a) gadolinium-enhanced T1-weighted magnetic resonance imaging (MRI) of optic nerve showing thickened and enhancing optic nerves (blue arrows); (b) thickened and enhancing optic chiasma on gadolinium-enhanced T1-weighted images (blue arrows); (c) longitudinally extensive cord lesion on T2-weighted sagittal images (blue arrows), and (d) brainstem lesion on T2-weighted sagittal images (blue arrows)