If the patient has a history of urological or pulmonary tuberculosis and the CT shows only focal calcification of the kidney, it is considered to be related to tuberculosis fibrous or caseous necrosis and calcification. It is recommended to review the CT every 6 months for more than 3 years to monitor the changes of renal calcification dynamically.2. If the kidney shows thick-walled cavity or solid occupancy except calcification, the presence of renal tumor can be considered. It is recommended to be hospitalized for observation, and enhanced CT scan is needed to differentiate, and if necessary, kidney puncture is needed to obtain biopsy specimens for pathological examination to confirm the diagnosis. 3. Calcification-like manifestations can also be formed in early crystallization or calcinosis cysts in the kidney. However, patients can have no symptoms of back pain, hematuria, and no symptoms of substantial kidney tumor or cystic tumor. If the calcification foci gradually increase or form stones and obstruct the renal pelvis or ureter, extracorporeal shock wave lithotripsy or surgical treatment such as percutaneous nephrolithotomy or ureteroscopic soft stone extraction is required.4. Calcification can also be formed in the kidneys if there is trauma, traumatic injury or renal vascular thrombosis causing renal infarction during the healing process. However, there is usually a history of trauma or injury to the lumbar region, which requires a detailed medical history and a comprehensive consideration in conjunction with the patient’s physical examination.