Impact of bacillus Calmette-Guerin intravesical therapy on the diagnostic efficacy of The Paris System for Reporting Urinary Cytology in patients with high-grade bladder cancer.

BCG therapy has a short-term adverse impact on the efficacy of urinary cytology. After BCG therapy, cases classified as suspicious for HGUC should be considered positive. Importantly, patients with false-positive cytology findings should be closely monitored.