A shadow in the pancreas may or may not be cancer. When there is an occupancy in the pancreas, there are benign occupancies and malignant tumors. A malignant tumor is pancreatic cancer, mostly invasive ductal carcinoma, which can occur in the head of the pancreas, or in the neck of the pancreatic body, or in the tail of the pancreas. If it is a pancreatic tumor, the tumor is hypointense, i.e., not strengthened, in the enhanced CT, three-dimensional reconstruction examination can be performed to understand the specific location of the pancreatic tumor, which will be of great help in the operation. There are also more benign pancreatic tumors, such as insulinoma, solid pseudopapillary tumor, pancreatic mucinous cystadenoma, or IPMN. A preoperative enhanced CT and, if necessary, a pancreatic MRI are needed to examine them.