Cyst is a benign disease, usually occurs in the liver or kidney more probability, in the ultrasound or CT can be found in the liver or kidney there is a mass, the mass has a peripheral membrane, the boundary is clear, the internal is liquid, that is, a packet of water, in medicine is called cystic fluid. Small cysts can be followed up, because it is a benign disease, will not form malignant, so there is no need to rush to surgery to remove, regular follow-up, review can be. If the cyst is relatively large, with symptoms of compression, affecting the liver or renal parenchyma, leading to liver or renal insufficiency, and there may be pain or vague pain in the liver or renal area, then consider surgical resection, and during surgical resection, the cyst only needs to be opened up and drained, so that the cystic fluid inside can be released. However, it is important to open the window large enough to drain the cyst, otherwise the cyst will recur after surgery.