CT scan findings of dissecting aortic aneurysm. The contrast CT scan shows a thoracoabdominal dissecting aortic aneurysm with a partial false lumen opening (71 mm of maximum short diameter), and exhibiting a saccular shape (red arrow in panels A–C). There are residual abdominal aorta dissection and a right common iliac aneurysm (yellow arrow in panel D). The aortic arch is repaired with a stent graft. (A) Cross-section of the aortic arch, (B) cross-section of the thoracic descending aorta, (C) cross-section of the infrarenal aorta, (D) cross-section of the bifurcation of the common iliac artery, (E) 3D-CT angiography at chest level.