Cerebral microvessel changes 10 days after reperfusion. A, Cerebral microvessel perfusion obtained by FITC-dextran was compared with normal cerebral microvessels in homologous contralateral areas. B, No leakage of FITC-dextran and slight dilation of microvessels occurred in benign hyperemia. C, The area showing hyperemia on DCE pMRI demonstrates FITC-dextran extravasations as well as significant vasodilatation in group 3. Bar = 100 μm.