Patient: discovered 10 years ago, at first 3cm, now 8cm No treatment, has been following up. I want to return to the country for treatment Chen Rong, Department of Urology, Shanghai Sixth People’s Hospital: Hello! Treatment of renal cysts must take into account the degree of adverse effects of the cyst on the kidney and the whole body, and depends on the size and development of the cyst. If the cyst is small (less than 5cm in diameter), no obvious pressure on the renal parenchyma or renal pelvis, no infection or malignancy, and people suffering from hypertension are not advocated for surgery, and regular ultrasound follow-up can be done for observation. If the cyst is larger (diameter greater than 5cm) or has the above-mentioned obvious compression of the kidney, infection and other manifestations, surgery should be performed, including: B ultrasound or CT-guided puncture injection of sclerosing agent, renal cyst removal, laparoscopic renal cyst removal is currently accepted by most doctors and patients in clinical practice because of the small trauma and fast recovery. From your letter, it seems that the cyst is already larger, so it is better to consider surgery.