fig 7.

A 54-year-old man with history of aphasia and right upper extremity weakness.

A, Axial noncontrast CT 20 hours after onset of stroke shows subtle low density in left nucleus lentiformis and periinsular region.

B, AP CTA 8 hours after onset of left hemispheric stroke shows severe stenoocclusive lesion of left M1 segment (arrow) but distal MCA segments are depicted as intense (right), indicating a seemingly good collateral blood flow.

C and D, In spite of therapy with intravenous heparine, on follow-up CT 7 days later, a large area of infarction has demarcated on axial noncontrast CT (C). Same-day CTA shows a markedly reduced filling of left MCA vessels (D).