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Fig. 1 —Line graph shows changes in mean percentage of enhancement above baseline with each type of vascular malformation on dynamic contrast-enhanced MRI. Mean percentage of enhancement of high-flow vascular malformations ({diamondsuit}) increases rapidly and decreases gradually, and that of low-flow vascular malformations ({blacksquare}) increases gradually. Note: percentage enhancement above baseline = (signal intensity after enhancement – signal intensity before enhancement) / signal intensity before enhancement x 100. Five sec before start of arterial enhancement is defined as 0 sec.