Renal cysts: treatment with alcohol.

Thirty-four benign renal cysts in 29 patients were treated with 95% ethanol during diagnostic aspiration with a 4.6 French pigtail catheter. All were followed by ultrasound from 3 to 30 months. There was one recurrence at three months. Minor complications of hematuria and temperature elevation were no more prevalent than with diagnostic aspiration alone. There were no major complications.