Aortic Branch Artery Pseudoaneurysms Accompanying Aortic Dissection. Part II. Distinction from Penetrating Atherosclerotic Ulcers

Branch artery pseudoaneurysms spare the pleural surface of the aorta and have nearly the same distribution around the circumference of the aorta as the origins of small aortic branch arteries. In contrast, ulcers tend to spare branch artery origins. The characteristic appearance and distribution of pseudoaneurysms on CT can help differentiate them from ulcers.