FIG 4. Left common carotid angiogram immediately after surgical creation of the anastomosis.

A, The carotid artery (arrows) on the anastomotic side is opacified in the early phase, indicating a high-flow diversion from catheterized side.

B, Bilateral retia mirabilia (arrowheads) are clearly identified, simulating an AVM nidus. The ramus anastomoticus (short arrows) and arteria anastomotica (long arrows), supplying the rete structure, represent the feeding vessels, while the same vessels on the anastomotic side act as the draining veins, emptying into the right jugular vein (open arrows) through the anastomosis.