Fig. 2

Morphological features of microcystic urothelial carcinoma. The cyst lining comprised epithelium of low to intermediate nuclear grade. Most cysts were lined by one or more layers of cells, which generally exhibited features indicative of transitional cells (a). Occasionally, the microcysts were lined by cuboidal cells (b), columnar mucinous epithelium (c), or signet ring cells (d). Urothelial dysplasia (e) and glandular urethritis with focal intestinal metaplasia were also detected in the peripheral mucosa (f)