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Scheme of intermittent endoleak (EL). A, Increased common iliac vein (CIV) pressure opened the valve, leading to an increase in intrasaccular pressure. B, When the aneurysm–venous fistula (AVF) closed, the sac expanded until the intrasaccular pressure was in equilibrium with that in its surroundings. P-Aneurysm, Pressure of aneurysm; P-CIV, pressure of common iliac vein.
