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Figure 5: Patient with a high-grade left MCA stenosis and prominent PCA collaterals. Panel A: ATM of this patient with a high-grade left MCA stenosis demonstrates that the territory supplied by the stenotic left MCA (small MCA territory in left hemisphere, blue) is markedly reduced compared to the right MCA (typical size of MCA territory in right hemisphere, blue). Panel B: The color-coded dynamic CTA of the same patient shows a reduction in the left MCA branches (blue) that is compensated for by an increase in left PCA branches (green) and, to a lesser extent, left ACA branches (red)

Figure 5: P<i>atient with a high-grade left MCA stenosis and prominent PCA collaterals. Panel A: ATM of this patient with a high-grade left MCA stenosis demonstrates that the territory supplied by the stenotic left MCA (small MCA territory in left hemisphere, blue) is markedly reduced compared to the right MCA (typical size of MCA territory in right hemisphere, blue). Panel B: The color-coded dynamic CTA of the same patient shows a reduction in the left MCA branches (blue) that is compensated for by an increase in left PCA branches (green) and, to a lesser extent, left ACA branches (red)</i>