Digital subtraction angiography of the superior mesenteric artery with a 5F Cobra catheter. (A) The lateral arteriogram shows the entry site of the false lumen and confirms the compression of the true lumen by an intimal flap (black arrows). (B) The posteroanterior arteriogram demonstrates the extension of the dissection to the origin of the accessory right hepatic artery (black arrows), which is also markedly narrowed. Note the patency of the distal arterial branches.