An urothelial papilloma (or Transitional cell papilloma) is a

papilloma A papilloma (plural papillomas or papillomata) ('' papillo-'' + '' -oma'') is a benign epithelial tumor growing exophytically (outwardly projecting) in nipple-like and often finger-like fronds. In this context, papilla refers to the projection c ...

developed from the

urothelium Transitional epithelium also known as urothelium is a type of stratified epithelium. Transitional epithelium is a type of tissue that changes shape in response to stretching (stretchable epithelium). The transitional epithelium usually appears ...

References

Benign neoplasms Glandular and epithelial neoplasia Urothelial tumor Urothelial lesion {{genitourinary-disease-stub