Modern sonography makes possible the detection of small and subtle changes in the normal echo pattern. These may represent significant pathological changes which can not al- ways be fully revealed by the echo pattern alone. There is, therefore, an increasing need for the supplement of the ultra- sonically guided percutaneous puncture, which can be per- formed with great accuracy and with virtually no risk. Also, ultrasonically guided puncture has proven invaluable for a wide variety of therapeutic purposes. The first percutaneous puncture guided by ultrasonic scanning using a specifically...