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A type IA lesion in a patient with MS. (A) Axial T2-FLAIR brain MRI shows several demyelinating lesions in the bilateral periventricular white matter (arrows). (B) CE T1WI shows a small central nodular enhancement in one of the lesions on the right side (arrow). (C–E) The lesion (arrow) is hyperintense on the DWI, hypointense on the ADC map, and hyperintense on the eADC map, indicating an early stage of inflammation with restricted water diffusion (cytotoxic edema).
