[Diagnostic difficulties in space-reducing kidney processes]

With the discussion of four cases the authors draw attention to the diagnostic difficulties which arise in the diagnosis of space reducing renal processes. They disapprove of the application of percutaneous puncture of the renal cyst as a therapeutic procedure, and emphasize, in doubtful cases, the importance of intraoperative histological examination. With two of their cases which were diagnosed only at the time of the second hospitalization of the patient, the authors wish to stress the need for a still wider use of angiographic examinations.