What are the stages of wilms tumor?

1-4: This is a simple breakdown-- stage 1-limited to kidney stage 2- outside the kidney stage 3-residual tumor after removal of the kidney inside the abdomen stage 4-metastasis to liver, lung, brain or other regions for more details you can go to: http://www.Cancer.Gov/cancertopics/pdq/treatment/wilms/healthprofessional/page3.

Four stages: Stages 1-4. One is small tumor involving only single kidney. Two is large tumor crossing midline. Three involves mets to vessels and lymph nodes. Four has distant mets to lungs, etc. Histology type is also very important.