Figure 1. Coronal 3D contrast-enhanced MR angiogram (repetition time [TR] msec/echo time [TE] msec, 5/2; 40° flip angle; 40 mL gadopentetate dimeglumine) demonstrates a thrombus occluding the main portal vein (short straight arrow), with a patent superior mesenteric vein (long straight arrow) and multiple collateral vessels (curved arrow) arising from the coronary vein and communicating with the esophageal and gastric veins.