Figure 11b. Chronic mesenteric ischemia. (a) Sagittal volume-rendered 3D multi-detector row CT scan demonstrates occlusion at the origins of the celiac axis (straight arrow) and SMA (curved arrow). (b) Coronal volume-rendered 3D multi-detector row CT scan demonstrates an enlarged inferior mesenteric artery filling the celiac axis and SMA in a retrograde fashion through collateral vessels (arrows).