Editing Wilms' tumor (section)

==== Bilateral ====
5% of Wilms' tumor cases at the time of initial diagnosis are bilateral involvements, which pose unique challenges to treatment. An attempt should be made {{according to whom|date=November 2018}} to stage each side according to the above criteria (stage I to III) on the basis of extent of disease prior to biopsy. Bilateral Wilms' tumors are as a whole placed in Stage V.