Fig 4.

On an axial FLAIR image (A), bilateral high-signal-intensity lesions are detected. DWI clearly demonstrates a high-signal-intensity rim at the periphery of the lesion in the right frontal lobe on trace DWI (B), with low ADC values (C) indicating restricted diffusion. On SWI (D), no abnormalities are seen. On follow-up MR imaging (3 months later), atrophic changes with dilation of the ventricles are observed in both hemispheres (more prominent in the right) (E). On DWI/ADC (F and G), no hyperintense rim is present. On SWI (H), a dark rim is clearly visible.