Fig. 1

a. A mass of approximately 4.0 cm diameter located in uncinate process of pancreas, the white arrow shows the calcification in the mass; b. The tumor was significantly enhanced in the arterial phase, which was similar to the surrounding pancreatic parenchyma; c. The black arrow shows that the intra- and extra-hepatic bile ducts were obviously dilated and the white arrow shows the slightly dilated pancreatic duct