Percutaneous renal cyst aspiration and treatment with alcohol.

Twenty-two simple renal cysts of 16 patients were aspirated under guidance of ultrasound, with a 20-gauge needle with stylet. Sixteen of those cysts were treated with 96% alcohol. All cysts that were not treated with alcohol recurred within 10 weeks. Treatment with alcohol revealed no recurrences in 3 months follow-up for 12 patients and 6 months follow-up for 4 patients. No major complications were encountered.