title: [Pathologic classification of upper urinary tract tumors].
abstract: OBJECTIVE
  To do an update on the upper urinary tract tumors classification systems.
  
  
  RESULTS
  Bibliography review of the various classification systems appeared over the last years, comparing them and reviewing their associated problems.
  
  
  CONCLUSIONS
  Current systematization advocated by WHO and ISUP are the most adequate for patient stratification. However, there are problems for coupling tumors with characteristics in the limit between some of their categories, so that we consider it will be convenient to review them.
authors.affiliation: Servicio de Urología, Hospital "Ramón y Cajal", Madrid, España.
authors.forename: Ricardo
authors.initials: R
authors.lastname: García-Navas
authors.forename: Ricardo
authors.initials: R
authors.lastname: García-González
authors.forename: Pilar
authors.initials: P
authors.lastname: Pérez-Sanz
authors.forename: Pilar
authors.initials: P
authors.lastname: González-Peramato
mesh_terms: D006801:Humans; D007680:Kidney Neoplasms / Q000145:classification* / Q000473:pathology; D014516:Ureteral Neoplasms / Q000145:classification* / Q000473:pathology; D014551:Urinary Tract / Q000473:pathology