Cysts combined with calcification of the cyst wall are commonly found in renal cysts, and its main causes include bleeding and infection of the cyst, calcium salt deposition within the cyst, calcium oxalate or calcium urate urinary retention and absorption of cystic fluid by the cyst wall, and so on. 1. Calcification of the wall of the cyst that has occurred in the cyst, such as hemorrhage, infection, etc., and eventually healed mechanically. 2. Calcification formed when calcium salts are deposited and absorbed by the cyst wall due to decreased secretion or uric acidification function of the cyst itself. 3. Calcium-containing substances, such as calcium oxalate or calcium urate, are contained in the urine, which stay in the cyst and eventually form calcification in the cyst wall. 4. The cystic fluid inside the cyst comes into contact with the cyst wall for a long time and is absorbed, thus causing calcification of the cyst wall. As most of them are benign lesions, patients need not worry too much, but still need to standardize the treatment under the guidance of doctors.