Patients often come to the doctor with a worried ultrasound sheet with a liver cyst on it and ask: Doctor, why do I have a growth on my liver, is it malignant? How to cure it? In fact, liver cyst is a benign lesion, commonly known as a “small blister” on the liver, how did this “small blister come about?” Most liver cysts are congenital, that is, they are formed due to some abnormalities in congenital development. Acquired factors are also present but rare, such as parasitic cysts in the liver in pastoral areas where people have contracted encapsulated cysticercosis. Cysts can be single or multiple, large or small, ranging from a few millimeters to tens of centimeters in diameter. Most of the small cysts are asymptomatic and are only found by chance during physical examination. If the cyst grows to compress the surrounding blood vessels or bile ducts, it will produce some compression symptoms, such as distension or discomfort in the right upper abdomen, upper abdominal mass, and jaundice and abnormal liver function in individual severe cases. Most liver cysts grow slowly and are benign lesions, so if they have no clinical symptoms or are small in size, they do not need treatment and can be observed regularly, but if they produce compression symptoms, they need surgery.