Classification of Adult Renal Tumors: An Update.

The fourth edition of the World Health Organization (WHO) report was published in January 2016 and focused especially on the kidney tumors and several new concepts. Many steps forward in the subclassification have been taken. Several new entities have been added, as major progress on a genetic level has been made. Some already well-known entities have new prognosis in accordance with longer follow up and research, and some concepts of well-known groups have been refined.