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Urothelium (or uroepithelium) is an example of transitional epithelium. It is the type of epithelium that lines much of the urinary tract including the renal pelvis, the ureters, the bladder, and parts of the urethra.
Urothelial papilloma of the bladder. The lesion is composed of a delicate fibrovascular core covered by normal-appearing urothelium. The superficial (umbrella) cells are often prominent and may display increased cytoplasm, vacuolization, and degenerative nuclear atypia.