One year of experience using the Paris System for Reporting Urinary Cytology

BACKGROUND The Paris System for Reporting Urinary Cytology (TPS) was published in November 2015. It focuses on the diagnosis of high‐grade urothelial carcinoma (HGUC) and provides criteria with which to define the category of atypical urothelial cells (AUC). The objective of the current study was to compare two 1‐year consecutive periods before and after use of TPS. METHODS A total of 1634 and 1814 urine cytology cases, respectively, were analyzed before and after use of TPS. Histological diagnosis within 6 months was available for 330 and 299 cases, respectively. RESULTS After use of TPS, the authors reported significantly fewer low‐grade urothelial neoplasms (0.94% vs 1.84%; P