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Fig. 1. —73-year-old man with atherosclerotic abdominal aortic aneurysm. Coronal maximum intensity projection of contrast-enhanced helical CT angiogram shows infrarenal abdominal aortic aneurysm. Aneurysm starts well below renal arteries (curved arrows) and ends at aortic bifurcation. True size of abdominal aortic aneurysm is indicated by calcification in wall of aorta (straight arrows) because mural thrombus deposited in abdominal aortic aneurysm sac results in smaller opacified lumen.