[An experience with nephrolithotomy under guidance of intraoperative ultrasonic scanning].

A 50-year-old male with small renal stones and ureteral stones underwent nephrolithotomy under guidance of electronic linear array ultrasound scanning. We used 5 MHz. and 7.5 MHz. ultrasound probes (Aloka model UST-587 T-5, UST-556 T-7.5). This intraoperative guidance was very useful to locate and remove small renal calculi which were impossible to remove by fibrin coagulum pyelolithotomy. The ultrasonogram of the 7.5 MHz. probe was clearer than that of the 5 MHz. one.