The pancreatic ducts in the pancreas are the main carriers of pancreatic juices into the intestinal lumen of the digestive tract to participate in digestion. The pancreas has a main pancreatic duct, which divides into secondary and tertiary secondary pancreatic ducts down the pancreas. The main pancreatic duct travels the entire length of the pancreas from left to right and joins the common bile duct at the duodenal papilla to enter the intestinal lumen to participate in digestion. The pancreas itself is divided into the head of the pancreas, the body of the pancreas and the tail of the pancreas, where the normal diameter of the pancreatic duct is different, for example, in the tail of the pancreas the diameter of the pancreatic duct is 1-2 mm, in the body of the pancreas is 2-4 mm, and in the head of the pancreas the normal diameter of the pancreatic duct is 4-5 mm, so when the pancreatic duct is dilated under the imaging of CT or helical CT, PET-CT, etc., the pancreatic duct measurement should be above the normal value. is the diagnostic criterion.