Figures 9, 10. (9) Portal vein obstruction caused by surgery for cancer of the pancreatic tail in an asymptomatic 66-year-old man. Contrast-enhanced 3D MR portogram with arterial-phase subtraction clearly shows obstruction of the superior mesenteric vein (solid arrow) and hepatopetal collateral pathways through the pancreaticoduodenal veins (open arrow). The aorta is not subtracted completely, and the left renal vein and inferior vena cava are superimposed on the portal vein and the collateral pathways. (10) Splenic vein obstruction after endoscopic sclerotherapy in a 61-year-old woman with alcoholic liver cirrhosis. Endoscopic sclerotherapy was performed to treat massive hemorrhage from a ruptured gastric varix. (a) Contrast-enhanced 3D MR portogram does not reveal the splenic vein. Note the filling defect at the confluence of the splenic and superior mesenteric veins (straight solid arrow). A gastric varix (open arrow), splenorenal shunt (arrowhead), and dilated left ovarian vein (curved arrow) are also seen. (b) Arterial portogram obtained with celiac arteriography reveals splenic vein obstruction with a dilated gastroepiploic vein as a hepatopetal collateral pathway. The gastric varix and splenorenal shunt are still patent, and the dilated left ovarian vein is seen emptying toward the pelvis. Iodized oil is seen in the splenic vein and gastric varix.