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FIG 2. Angiographic AP view demonstrates a right carotid occlusion test in a 45-year-old man with a large cervical tumor. A, Late arterial phase demonstrates excellent cross-filling through Acom. B, One second after the previous image, beginning of venous phase on the left side (white arrow) and still some cortical arteries in the right hemisphere (indicated as 0 seconds). C, One second later, there are still cortical arteries on right side and veins on the left side (white arrow). D, One second later (ie, venous phase on 2 seconds) shows the veins filled in both hemispheres (black arrow on the right side and white arrow on the left side). This patient had a 2-second venous drainage delay, and permanent occlusion was performed at the same time.
