Ultrastructural alterations after reperfusion. A, Three hours after reperfusion, slightly swollen glial end-foot processes were observed and capillaries showed opening lumen in group 1. B, Ten days after reperfusion, swelling of glial end-foot processes attenuated and an irregular luminal surface was observed in the same group. C, In group 3, enlargement of endothelial cell nuclei as well as marked edema of glial end-foot processes was found. D, Ten days after reperfusion, the edema became more severe in group 3. Bar = 2 μm.