Pancreatic cysts include true cysts, pseudocysts, and cystic tumors. True cysts include congenital simple cysts, polycystic disease, dermatomal cysts, and retention cysts, which are covered with epithelium on the inner wall. Cystic tumors include cystic adenoma and cystic carcinoma. The wall of pseudocysts is composed of fibrous tissue and is not covered with epithelial tissue. Clinically, pancreatic cysts are most common. The treatment of pancreatic pseudocysts is mainly surgical. Pseudocysts tend to persist and increase in size because they often communicate with branches of the pancreatic duct and functional pancreatic tissue. Unless a few small cysts can dissipate on their own, about 85% of pseudocysts are non-surgical. The timing of surgery: Most believe that postponement of surgery is appropriate to allow enough time for the cyst wall to form a mature fibrotic envelope. Premature surgery is often due to the brittle cyst wall, which cannot be effectively sutured and is prone to postoperative anastomotic fracture. The best option is to follow up with ultrasound during the observation period to see if the cyst dissipates or increases in size. If the cyst is found to increase or does not dissipate on its own after 7 weeks, surgery should be performed. 2.Surgical methods: (1) Cyst removal: the most ideal method, but mostly only for small cysts in the tail of the pancreas, the operation is more difficult for large cysts. (2) Cyst drainage: In the past, external drainage was considered the preferred method for treating pancreatic pseudocysts, but due to the high incidence of pancreatic fistula after external drainage, most scholars are now gradually moving toward internal drainage. The complications after external drainage are more frequent, in order of pancreatic fistula, abdominal abscess, pancreatitis, cyst recurrence and bleeding. (3) Pancreatic resection: Pancreatic resection is often performed when the pancreas has serious lesions or malignant tumors, and can be done as pancreaticoduodenectomy, pancreatic body caudal resection or total pancreatectomy.