The pancreas is a digestive organ that produces pancreatic enzymes that are involved in the digestion of food. The more common site of pancreatic cancer is the head of the pancreas, and imaging shows a mass in the head of the pancreas with poorly defined borders, irregular morphology, and internal necrosis. Pancreatic cancer is a tumor lacking blood supply, i.e. the tumor itself is not rich in blood supply. Therefore, when enhanced examination is performed, the cancer shows relatively low enhancement and a low-density mass area against the obvious enhancement of normal pancreatic tissue around the tumor. The head of the pancreas is the area where the common bile duct and the pancreatic duct travel. If pancreatic cancer occurs in the head of the pancreas, it will produce bi-directional obstruction to the bile duct and pancreatic duct, resulting in dilatation of the pancreatic duct and bile duct, which is called the double duct sign.