Fig. 2

Histological findings of the biopsy sample. a Low power view showed a stromal–epithelial lesion (×40). b The urothelial epithelium lining the surface showed mild-to-moderate dysplasia, cell polarity disorder, and inconspicuous mitosis. The myxoid stroma showed no dense cellularity, significant atypia, or mitosis (×400). A diffuse expression pattern of p53 (c) and a relatively high proliferation index determined by Ki67 staining (d) were found in the urothelium (×400)