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Initial MR images obtained 3 days after onset (before intravenous immunoglobulin therapy).
A, Axial T2-weighted image (TR/TE, 4700/102) shows no abnormal signal intensity in the brain.
B, Axial diffusion-weighted images (echo-planar imaging; TR/TE, 7000/77; b = 1000) show no apparent restriction of diffusion.
