Fig. 2

The early phase of contrast-enhanced CT (coronal view); A large homogeneous low-density lesion ( ) spread widely from the peri-pancreatic head to the hepatic hilar plate, the hepatoduodenal ligament, duodenum, and the root of the mesenteric artery and vein. The intrahepatic duct and the common hepatic duct were dilated. The lower bile duct was involved and obstructed by the central part ( ) which showed lower density than the peripheral part. Ao aorta, ASPDA anterosuperior pancreaticoduodenal artery, CBD common bile duct, Du duodenum, GB gall bladder, SMA superior mesenteric artery, SMV superior mesenteric vein, PD pancreatic duct, PV portal vein