FIG 5. Cases 3 (A and B) and 5 (C and D). Sample cases with chronologic changes in striatal lesions (arrow).

A, At 1 month after the onset of symptoms, diffusion-weighted imaging reveals left striatal lesions. Note that the anterior portion of the left putamina appears more hyperintense than the posterior portion.

B, At 3 months after the onset of symptoms, diffusion-weighted imaging reveals that the left putaminal lesions spread posteriorly and entirely, as compared with the findings in A.

C, At 3 months after the onset of symptoms, diffusion-weighted imaging shows the right striatal lesion. Note that the high-signal-intensity change in the putamen is restricted to its anterior portion.

D, At 5 months after the onset of symptoms, diffusion-weighted imaging shows that the putaminal lesion has spread in the posterior direction, as compared with the findings in C.