Objective:To assess the method and the curative effect of percutaneous puncture aspiration and sclerosing treatment of renal cyst under CT-guidance.Methods:58 renal cysts in 45cases diagnosed with ultrasonography or CT were treated with repeated sclerotherapy by percutaneous puncture aspiration and 99.7% ethanol injection.A 18～21G gauge aspiration needle was used for all patients;the amount of administration of ethanol was 25%～30% of the aspirated amount of cyst fluid.Its effect was reviewed and analyzed every four months after operation.Results:The puncture was completed in 53 cysts one time.The patients followed up three months to one year

35 renal cysts in 25 patients disappeared;18 renal cysts in 15 patients reduced in size;and 5 renal cysts in 5 patients had no change.The effective rate was 91.3%.The disappearance rate was 60.3%.There were no serious complications.Conclusion:The sclerosing treatment percutaneous puncture aspiration of renal cyst under CT-guidance is a safe and effective method

and it is of significant value in application.