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Blood flow saturation effect on 3D MRA. A) A giant aneurysm (arrow) in distal ICA and another small aneurysm in the right MCA trifurcation (arrowhead) are demonstrated on DSA. B) The 3D-SSD MRA does not show the entire ICA aneurysmal sac (arrow) because of flow saturation effect of turbulent flow. The right MCA aneurysm (arrowhead) is also not seen, and this is thought to be the result of a blood flow saturation effect.
