Retrograde brushing to the urothelial tumors of the upper urinary tract for early diagnosis and treatment.

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Abstract
Our retrograde brushing catheter technique to obtain cytology specimens from upper urinary tract is useful to increase the diagnostic accuracy. Con-ventional cytology in 9 patients in study group and in 40 control group both with transitional cell carcinoma showed 30 percent and 35 percent of positive rate, respectively, while the brushing technique in the 9 patients increase the positive rate up to 89 percent and the difference is statistically significant (P<0.5%). There were no false positive in benign cases.

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