[Cytodiagnosis of pathologic changes in the renal pelvis and ureter]

In 80 cases of roentgenologic filling defects in renal pelvis and ureter, which could be determined exactly preoperatively, we could confirm the diagnostic value of cytology from washings of renal pelvis and ureter (lavage cytology) especially in preoperative diagnosis of carcinoma of renal pelvis and ureter. Twenty of 25 tumors (80%) were detected preoperatively. There were no false positive results. The diagnostic reliability of this method was more accurate than with normal exfoliative urinary cytology from other authors. The results are discussed together with the literature.