The parapapillary papilla of the descending duodenum is a normal variant of anatomical structure in the human body that usually supplements the function of the main duodenal papilla. In normal people, there is a protrusion in the duodenum called the duodenal papilla, which is the lower end of the opening in the medial wall of the descending part of the duodenum after the confluence of the main pancreatic duct of the pancreas and the common bile duct. Digestive juices secreted by the pancreas flow into the intestines through the subopening, where they are digested and absorbed. However, in some people, there is a parapancreatic duct in the pancreas, which also has an opening in the descending portion of the duodenum, known as the duodenal parapapapillary, which is usually located about 1-3 centimeters above the duodenal papilla, and is a normal variant of the anatomical structure. Some of the digestive juices secreted by the pancreas also enter the intestines through this channel and play a role in the digestion and absorption of food, so the duodenal parapapillary papilla can be used as a complementary structure to the function of the duodenal papilla.