Figuratively speaking, kidney cyst is a kind of blister produced on the kidney, which is a very common disease of the kidney in adults and does not show obvious symptoms in normal times. For the examination of kidney cysts, you can go to the hospital for x-ray, nephrography, kidney ultrasound, radionuclide scan and CT examination. By doing this series of imaging examinations, you will be able to completely confirm the diagnosis of kidney cysts. Kidney cysts do not have a great impact on the function of the kidney itself, so they cannot be detected by taking blood for kidney function tests. Because a renal cyst is a kind of blister, it can be revealed very clearly through imaging examination, and B-type ultrasound and CT can easily distinguish a renal cyst from a substantial renal tumor, which can effectively help clinicians make a clear diagnosis. Although renal cysts are not really tumors, they are very easy to be confused with tumors, so it is very important to distinguish renal cysts from renal malignant tumors, which can be identified by renal parenchymal tomogram or renal arteriogram. Patients with asymptomatic renal cysts should have frequent urine examination, including urine routine and urine culture, and kidney function examination, including creatinine clearance, every six months.