[Diagnosis of renal tumors with percutaneous biopsy].

The authors describe four, out of 506 cases of renal biopsies in which this diagnostic procedure enabled to reveal a tumour. Two cases of tumours which were intentionally subdued to renal biopsy justified an angiomyolipoma and a focus (metastasis) of tubulopapillomatous carcinoma) in the kidney. In one case the renal biopsy revealed renal infiltration thus enabling to state the diagnosis of chronic lymphatic leukaemia subsequently, and in the last case where the diagnosis of chronic lymphatic leukaemia had been stated in advance, the renal biopsy was performed due to suspective glomerulonephritis. In these cases the unexpected results of renal biopsy were of great diagnostic value. Such intentional use of biopsy is rare. (Fig. 3, Ref. 6.)