title: [Can inverted papilloma in urinary bladder be considered as a benign tumor].
abstract: Inverted papilloma of the urinary bladder is a rare entity. According to literature data, this disease is not malignant, and has low recurrence rate. Authors studied cases detected at the Urology Department and Urooncological Centrum at Semmelweis University in the last 11 years. They aimed to find out the rate of inverted papilloma recurrences, and transformations into malignant bladder cancer.
  
  
  METHODS
  Thirty patients with histologically proven inverted papilloma were followed after transurethral resection of bladder, which meant urine tests every three months, abdominal ultrasound and cystoscopy. After a year, these examinations were done in every six months.
  
  
  RESULTS
  Three patients presented transitiocellular carcinoma (17, 60, 92 months later) during this period. In one case, inverted papilloma and transitiocellular tumor (pTa G1) were detected. In one patient, inverted papilloma was found by control cystoscopy after transurethral resection of bladder (pT1 G2) and local chemotherapy 15 months later.
  
  
  CONCLUSIONS
  Based on authors' experience, inverted papilloma of the urinary bladder is a benign lesion, but malignant changes or concomitant transitiocellular tumor may occur, thus follow-up is needed. Although references are not standardized, authors suggest following patients with inverted papilloma as a primary (pTa G1) bladder cancer.
authors.affiliation: Semmelweis Egyetem, Altalános Orvostudományi Kar, Urológiai Klinika és Uroonkológiai Centrum, Budapest. rieszp@freemail.hu
authors.forename: Péter
authors.initials: P
authors.lastname: Riesz
authors.forename: Eszter
authors.initials: E
authors.lastname: Székely
authors.forename: Péter
authors.initials: P
authors.lastname: Törzsök
authors.forename: Attila
authors.initials: A
authors.lastname: Majoros
authors.forename: Attila
authors.initials: A
authors.lastname: Szendroi
authors.forename: Péter
authors.initials: P
authors.lastname: Dombovári
authors.forename: Imre
authors.initials: I
authors.lastname: Romics
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003558:Cystoscopy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000473:pathology* / Q000601:surgery; D018308:Papilloma, Inverted / Q000473:pathology* / Q000601:surgery*; D011230:Precancerous Conditions / Q000473:pathology* / Q000601:surgery; D011379:Prognosis; D011446:Prospective Studies; D014521:Urethra; D001749:Urinary Bladder Neoplasms / Q000473:pathology* / Q000601:surgery*