(a)
(b)
Figure 1: Initial (a) MRI with unremarkable diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) as well as FLAIR images. Follow-up MRI (b) shows small ischemic lesions (arrow) in the left MCA territory on DWI. PWI is unremarkable. FLAIR images demonstrate gadolinium enhancement in the subarachnoid space in the left MCA territory (arrows).