title: [Nephrogenic adenoma of the bladder: metaplasia or embryologic alteration?].
abstract: OBJECTIVE
  To present a new case of nephrogenic adenoma of the bladder and to review the current concepts on the etiopathogenesis of this lesion.
  
  
  METHODS
  Seventy years old female with repetitive haematuria who was diagnosed as having a nephrogenic adenoma of the bladder which was extirpated by cold biopsy forceps. No tumoral relapse was detected after 16 months of follow up.
  
  
  CONCLUSIONS
  In the light of the present knowledges, the origin of nephrogenic adenoma is a phenomenon of urothelial metaplasia due to a chronic irritative stimulus wich would lead a cellular proliferation with potentialities to originate mesonephric tissues and which starting point could be on not completely involutioned mesonephric cellular rests and/or on de-differentiated mature urothelial cells.
authors.affiliation: Servicio de Urología, Hospital Comarcal de Monforte, Lugo.
authors.forename: M A
authors.initials: MA
authors.lastname: Sousa Escandón
authors.forename: J
authors.initials: J
authors.lastname: Pérez Valcárcel
authors.forename: M
authors.initials: M
authors.lastname: González Fernández
authors.forename: A
authors.initials: A
authors.lastname: González Rodríguez
authors.forename: J A
authors.initials: JA
authors.lastname: Lapeña Villarroya
authors.forename: C
authors.initials: C
authors.lastname: Uribarri González
mesh_terms: D000236:Adenoma / Q000473:pathology*; D000368:Aged; D005260:Female; D006801:Humans; D008679:Metaplasia; D001743:Urinary Bladder / Q000196:embryology* / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000473:pathology*