We report on a case of a renal tumour that showed a solid volume in CT analysis, but could only be diagnosed and evaluated precisely using the selective i.a. DSA method thus enabling a decisive statement on operative planning.

Sonography guarantees in a simple manner visualisation of the kidneys and of the renal tract independent of functioning. Besides enabling an exact localisation, sonography yields accurate data on the spatial depth. Hence, it must be considered the method of choice for antegrade pyelography and percutaneous nephropyelostomy, especially if the kidney is inactive. The requisite puncture is performed according to a modified Seldinger technique. The article reports on technical details, indication and results based on a study of 20 patients.