Micropapillary urothelial carcinoma of the urinary bladder: A clinicopathological analysis of 24 cases

Objectives: To stratify patients with micropapillary urothelial carcinoma of the urinary bladder based on the percentage of micropapillary component and to correlate tumor volume with other clinicopathological features. Methods: Cases of micropapillary urothelial carcinoma of the urinary bladder from 2002 to 2009 were identified. Only patients with available follow‐up information were included in the analysis. Tumor volumes were stratified based on the percentage of micropapillary component (50% and 100%). Results: Overall, 24 cases were analyzed. Mean patient age was 71 years (range 55–86 years), with a male to female ratio of 3:1. Six cases (6/24; 25%) were composed entirely of micropapillary component. A total of 12 cases (12/24; 50%) showed >50% micropapillary component. Six cases (6/24; 25%) showed