Figure 3.

(a) DSA of the left vertebral artery (lateral view) demonstrates an intensely vascular hemangiopericytoma at C2–C3 with marked arteriovenous shunting. The mass also receives vascular supply from the right vertebral artery, bilateral ascending cervical arteries, and left deep cervical artery (not shown). (b) Post-embolization unsubtracted image demonstrates the Onyx cast (black arrow) in the mass at C2–C3. The deployed coil mass (white arrowhead) is visualized at the junction of the V2 and V3 segments. (c) Post-embolization DSA of the left vertebral artery (lateral view) demonstrates occlusion of the left vertebral artery by the deployed coil mass (white arrowhead). There is considerably reduced tumor opacification after injection of Onyx (black arrow) into one vertebral artery branch and PVA particle embolization of remaining vertebral artery feeders from a proximal position in the vertebral artery.

DSA: digital subtraction angiography; PVA: polyvinyl alcohol.