[Pathologic classification of upper urinary tract tumors].

OBJECTIVES

To do an update on the upper urinary tract tumors classification systems.

METHODS/

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.