Hepatic cysts are a relatively common benign disease of the liver and are divided into parasitic and nonparasitic hepatic cysts. The former is more common with hepatic encapsulated worm disease, while the latter can be classified as congenital, traumatic, inflammatory and hepatomatous cysts. The most common clinical condition is congenital hepatic cysts, which can be subdivided into monogenic and multiple. Its etiology is as follows: 1. Non-parasitic hepatic cysts: (1) The etiology of congenital hepatic cysts is unclear, and it is generally believed that they originate from the vagal bile ducts in the liver or result from the developmental disorders of intrahepatic bile ducts and lymphatic ducts in the embryonic period. However, some scholars believe that it may be caused by fetal cholangitis, obstruction of small intrahepatic bile ducts and gradual cystic dilatation of small proximal bile ducts, or local hyperplasia and obstruction of intrahepatic bile ducts after degeneration. (2) Traumatic cysts are mostly advanced lesions with central rupture caused by blunt contusion of the liver, and are usually solitary pseudocysts. (3) Inflammatory cysts are cystic dilatation of intrahepatic bile ducts caused by obstruction of bile ducts by intrahepatic bile duct stones, also known as retention cysts. (4) Hepatoma cysts are mostly formed by necrosis and liquefaction of malignant tumor center. (2) Parasitic liver cyst is a parasitic disease caused by parasites, such as hepatic encystment, which is caused by the parasitic cystic larvae of the canine tapeworm in the liver.