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Fig 5. Regional changes in CBF compared with extent of AV shunt. 
= contralateral – ipsilateral CBF in measured regions of interest in white matter near the AVM, the cortex near the AVM, the thalamus, and the basal ganglia. A, Cortical gray matter CBF values are negatively but weakly correlated with percent AV shunt and are not significant. (B) values in white matter (R2 = 0.70, F = 11.58, P = .02) are negatively correlated (blood flow in adjacent ipsilateral white matter increases as percent shunt increased). Basal ganglia values (C) show little change in CBF with the size of the AV shunt, but thalamic CBF (D) appears to decrease ipsilaterally as percent AV shunt increases (R2 = 0.74, F = 14.19, P = .01).
