Figure 2

Sagittal angiography comparing the vasculature after injection of the contrast agent through the left middle cerebral pedicle, before and after endovascular embolization. (A and D) show the early arterial phase. (B and E) show the late arterial phase. The black arrow in B shows the arteriovenous malformation nidus. (C and F) show images during the capillary phase. The large tortuous draining vein is clearly visible in place of the arteriovenous malformation nidus. We estimated a 50% reduction in arteriovenous malformation size after embolization.