Figure 7a. Total occlusion of the infrarenal abdominal aorta. (a) Contrast-enhanced axial CT scan shows a totally occluded infrarenal abdominal aorta (large arrow). Note the enlarged pancreaticoduodenal arcades (small arrows) and epigastric arteries (arrowheads). (b) Lateral volume-rendered image shows complete thrombosis of the infrarenal abdominal aorta and occlusion of the celiac trunk and superior mesenteric artery (large arrows). Note the patency of the inferior mesenteric artery (arrowhead) and the enlarged epigastric arteries in the abdominal wall (small arrows).