[Determining the diagnosis--tumor of the kidney pelvis--using sonography]

The advantages and deficiencies of diagnostic imaging procedures especially of ultrasonography in the diagnostics of solid masses in the renal collecting system are presented. The intravenous urography is important as basic examination, but ultrasonography is valuable for additional information especially in the non-functioning kidney. A tumor could identified in the renal collecting system if its size is greater than 10 mm.