[Stereoroentgenology in endourology].

Three-dimensional stereofluoroscopic pictures of the kidney and renal calyces were first used for percutaneous renal surgery with a laboratory prototype equipment. The grid-controlled X-ray tube provides sequential images, which are separated into pairs by digital image processing and storage and can be seen on a 3-D display unit. This method allows exact and rapid puncture of a suitable calyx for percutaneous nephrolithotomy, shortens the learning process for the endourologist, reduces the radiation exposure, and thus makes the method safer.