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Fig. 5 —Scatterplot shows contrast rise time for each vascular malformation. All high-flow vascular malformations show contrast rise time of less than 20 sec. High-flow vascular malformations show shorter contrast rise time than low-flow vascular malformations, with no overlap between the two. Use of threshold contrast rise time of 30 sec would result in 100% (6/6) sensitivity and 100% (10/10) specificity for differentiation of high-flow from low-flow malformations. Note: contrast rise time = time between onset of lesion enhancement and time of maximal percentage of enhancement above baseline within 120 sec. Onset of lesion enhancement is defined as 0 sec. Number next to is number of patients at that enhancement time.