title: Inverted urothelial papilloma: a lesion with malignant potential.
abstract: Two cases of inverted urothelial papilloma are presented. In the first case the inverted papilloma was in the ureter and varying degrees of cellular atypia were demonstrated on histology: 7 years later, a single bladder lesion consisting of papillary transitional cell carcinoma and inverted papilloma developed in the same patient. In the second case a bladder tumor consisting of inverted papilloma mixed with papillary infiltrating transitional cell carcinoma was detected. The peculiar morphological findings, histogenesis and biological behavior of inverted urothelial lesions are discussed.
authors.affiliation: Department of Surgical Pathology, Ospedale Maggiore S. Giovanni Battista, Torino, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Risio
authors.forename: S
authors.initials: S
authors.lastname: Coverlizza
authors.forename: F
authors.initials: F
authors.lastname: Lasaponara
authors.forename: E
authors.initials: E
authors.lastname: Vercesi
authors.forename: G
authors.initials: G
authors.lastname: Giaccone
mesh_terms: D000368:Aged; D002295:Carcinoma, Transitional Cell / Q000473:pathology*; D004848:Epithelium / Q000473:pathology; D006801:Humans; D008297:Male; D010212:Papilloma / Q000473:pathology*; D014513:Ureter / Q000473:pathology*; D014516:Ureteral Neoplasms / Q000473:pathology*; D001743:Urinary Bladder / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000473:pathology*