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FIG 1. MR images of patient 12, who was studied 1 hr after the onset of stroke.
A, MR angiogram (43/2.3/1 [TR/TE/excitations]) shows left MCA occlusion, mild caliber reduction of the supraclinoid tract of the left internal carotid artery with respect to the contralateral one, asymmetry in the A1 segments (right > left) with good filling of both the anterior cerebral arteries (A2 tracts), and left posterior cerebral artery filling out farther than the contralateral one.
B, Contrast-enhanced T1-weighted images (560/14/2) show marked vascular enhancement of the thin vessels in the left superficial frontotemporal region.
C, Diffusion-weighted image (left) (6000/64/1) shows early damage in the left deep MCA territory. The lesion extent is substantially unchanged on the follow-up MR image (right) (FLAIR image obtained 1 week later [6000/100/2]).
D, Perfusion-weighted maps show an increase of both rCBV (left) and MTT (right) in the left superficial MCA territory, outside the area of altered diffusion-weighted imaging (outlined). The rCBV and MTT asymmetries were 105% and 54%, respectively.
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