FIG 2. Images in a 38-year-old woman with a suboccipital arteriovenous fistula. Lateral volume-rendered 3D-DA of a left VA rotational acquisition shows the extracalvarial arterial supply coursing along the occipital bone to the scalp arteriovenous fistula. The arterial supply is via C1 and, to a lesser extent, C2 muscular branches of the VA. Note the large occipital varix (asterisk). A left posterior meningeal artery (arrowheads) is coursing along the inner aspect of the occipital bone, but it does not participate in vascularization of the lesion.