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. 2021 Oct 14;13(3):399–409. doi: 10.1007/s12975-021-00953-x

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© The Author(s) 2021

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Fig. 2 — Illustration of patients with anterograde and retrograde collaterals. (A) A 76-year-old man had acute infarction in the right centrum semiovale (arrow) on diffusion weighted imaging (DWI), with prolonged mean transit time (MTT, red arrowhead) and reduced cerebral blood flow (CBF, yellow arrowhead). The dynamic perfusion imaging showed a perfusion defect (red circle) with anterograde collateral flows (star), which was present as a decreased signal in the center. (B) A 79-year-old man had acute infarction in the right basal ganglia on DWI (arrow) and a perfusion defect on MTT (red arrowhead) and CBF (yellow arrowhead). Dynamic perfusion imaging showed a perfusion defect (red circle) with retrograde collaterals (star), which was present as a decreased signal at the periphery of the circle (star)