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Fig. 1C. —18-year-old man with peripheral vascular malformation in vastus intermedius muscle of upper leg. Diagnostic angiography confirmed MR categorization of capillary—venous malformation. Sagittal dynamic contrast-enhanced subtraction MR image, obtained at same level as B but 6 sec later, shows arterial enhancement (arrowhead) and more intense lesion enhancement (arrow). On basis of MR criteria of early lesion enhancement (6 sec after arterial enhancement), presence of dilated venous spaces, and absence of flow voids, we categorized this lesion as capillary—venous malformation.