MPR in the portal venous phase of the patient shown in Fig. 7. MIP and MPR, performed respectively in the portal vein phase, directly showed that the pancreaticoduodenal vein semi-surrounded and adjoined the common bile duct, which led to a slight narrowing of the common bile duct and a secondary expansion of the common bile duct and part of the intrahepatic bile duct. MPR, multi-planar reconstruction; MIP, maximum intensity projection.