318973.fig.001a
(a)
318973.fig.001b
(b)
Figure 1: Microscopic findings. (a) Atypical glandular structures including mucinous materials in the lumens are irregularly dispersed in the fibrous stroma. Epithelium lining these glandular structures shows urothelial differentiation with focal mucinous metaplasia. (b) In another area, there is extensive proliferation of both small glandular structures and admixed fibroblasts.