CTA CT Abdomen and pelvis and CTA lower limbs
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CT angiography shows a occluded infrarenal aorta and common iliac arteries with an extensive anterior collateral pathway to supply lower limbs blood flow - Superior epigastric arteries to the inferior epigastric arteries and inferior epigastric arteries to the external iliac arteries.
There is also a communication between the proximal superior mesenteric artery (SMA) and the proximal inferior mesenteric artery (IMA) - Arc of Riolan. Note that the origin of IMA is occluded and this anastomosis ensure the arterial flow to it.