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[The importance of radiological examination for the prognosis of obstructive renal changes (author's transl)].

The importance of various radiological methods is discussed in relation to obstructive changes in the kidney which cannot be visualized by the usual radiological investigations. The applicability and limits of intravenous urograms with dense contrast media, retrograde pyelography, arteriography and selective perfusion, minimal nephrostomy with repeated nephrostomograms and translumbar pyelography are discussed. It is shown that translumbar puncture is an alternative for the prognostic assessment of the hydronephrotic kidney.