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.

Agenesis of the bladder is an extremely rare anomaly with only approximately 40 such cases reported in the literature. We report on a 30-year-old female patient who also had right renal agenesis.

In the second half of 1985, 15 patients with 25 bladder stones were treated with Lutzeyer's Ultrasonic Lithotriptor. Of the patients 13 underwent additional operations, mostly transurethral resection of the prostate. The average duration of lithotripsy was 30.5 minutes. Some difficulties were experienced especially when drilling hard stones and as a complication late urethral bleeding occurred in one patient.

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An anterior transperitoneal approach was used to remove the stones from both kidneys and/or ureters simultaneously in 18 patients. The morbidity of this type of surgery in our study was very low and there were no surgical difficulties in exposing the intrarenal structures. Furthermore, especially in secondary cases, this approach was easier and more time-saving than the classical flank approach. We recommend its use at least in selected groups of patients in whom peritoneal gross contamination is not expected.