Figure 1

Contrast-enhanced computed tomography during the portal phase. (A) The axial image at the level of the proximal superior mesenteric artery shows a dissection with a mural thrombus (white arrowhead), which is associated with minimal inflammation of the mesentery. Note the accessory right hepatic artery (black arrows) that runs behind the portal vein. (B) The axial image at a lower level shows extension of the dissection to distal arterial branches (white arrows). The small bowel and the colon have a normal appearance. (C) The curved multi-planar reconstruction along the main trunk of the superior mesenteric artery shows the origin of the dissection approximately 1 cm from its ostium and distal extension to a jejunal artery (white arrows). The true lumen of the superior mesenteric artery is severely compressed by a dilated, partially thrombosed false lumen (white arrowhead).