[Differential diagnosis of contrast medium recesses of the renal pelvis or the renal calyx system (author's transl)].

Contrast medium recesses in the renal pelvis and calyx system of a retrograde pyelogram or urogram are due to many widely different pathologico-anatomical changes in the renal region. It is the aim of the present study to show up this multitude of differential diagnostic possibilities which lead to contrast medium recesses in the renal pelvis and renal calyx system of a pyelogram.