Portal venous phase coronal section MPR showed an abnormal density shadow with an irregular shape of relatively low-density soft tissue in the porta hepatis area, which blocked the common bile duct, invaded the intrahepatic right and left bile ducts and expanded the intrahepatic bile duct in the right and left liver lobes. There was also a relatively high-density calculus at the extremitas anterior of the common bile duct. MPR, multi-planar reconstruction.