Arterial phase lateral view angiograms of a right cavernous internal carotid artery aneurysm, (a) initial pretreatment angiogram, (b) immediate contrast stasis within the aneurysm at the end of deployment of two telescoping pipeline embolization devices, and (c) carotid cavernous fistula on angiogram at 4 months after treatment done for symptoms of right eye pain, swelling, and vision loss. Note filling of aneurysm sac in (c) as well as venous drainage in the enlarged superior ophthalmic vein (arrow) and the pterygoid venous plexus (double arrows).
