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Fig. 5 —Blood volume flow (BVF) values (mean ± standard error of the mean [SEM], median) of five patients with probable unilateral moyamoya disease in comparison with values for healthy subjects serving as controls. Symptomatic (moyamoya) internal carotid arteries (ICA) have significantly lower blood volume flow than control arteries and contralateral ICAs. Blood volume flow was greater in contralateral (normal) ICA and basilar artery than in controls. All results were highly significant. Bars indicate blood volume flow within arteries studied. ^**Statistically significant difference between groups (p < 0.05). PMM = probable (unilateral) moyamoya disease, CON = controls, ICA S = symptomatic (moyamoya) internal carotid artery, ICA C = contralateral (normal) internal carotid artery, ICA = internal carotid artery, BA = basilar artery.