title: Inverted papilloma of bladder. Two cases with questionable malignancy and squamous metaplasia.
abstract: Two new cases of inverted papilloma of the urinary bladder are presented: one is a benign tumor with marked squamous metaplasia, and the other shows questionable malignancy in a single polypoid mass. This malignant transformation cautions against overconfidence in the benign nature of inverted papilloma of the urinary bladder. The authors believe that careful pathologic examination is necessary for inverted papilloma of the bladder.
mesh_terms: D004848:Epithelium / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008679:Metaplasia; D008875:Middle Aged; D010212:Papilloma / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000473:pathology*