Comparisons of pre- and post-unilateral STA-MCA bypass on white matter CVR in the ipsilateral revascularized and contralateral nonrevascularized hemispheres in patients with MMD, Moyamoya syndrome, and steno-occlusive and atherosclerotic disease. The white matter CVR in revascularized and nonrevascularized hemispheres is shown in different vascular territories: MCA (A), ACA (B), and PCA (C). The box denotes the interquartile range (25%–75%), the horizontal line in the box denotes the median, and the whiskers denote the minimum and maximum values. Double asterisks indicate P < .01; 4 asterisks, P < .0001.