Ultrasonography of the retroperitoneum.

Ultrasonographic investigation of the kidneys and efferent urinary tract as well as juxtarenal organ regions has become an indispensable screening method in urology today. Various diseases of the kidneys can be detected rapidly and noninvasively. Some of these clinical pictures are discussed in detail. Above and beyond simple imaging, ultrasonography also allows special diagnostic interventions (biopsy) and therapeutic measures (i.e. nephrostomy).