Figure 1 (A) Initial MRI findings. Fluid attenuated inversion recovery (FLAIR) sequence image showing diffuse white matter hyperintensity at both infra and supratentorial levels and in the basal ganglia. Hyperintensity extends from the periventricular white matter to the cortex. Diffusion‐weighted images (DWI)‐weighted MRI was normal. (B) MRI 3 weeks later. FLAIR sequence image showing dramatic improvement of the abnormalities but two areas of hyperintense signals in the right frontal region are shown without abnormalities on DWI‐weighted MRI.