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About 500 new cases of Wilms tumors are found each year in the United States. About 5% of all cancers in children are Wilms tumors. Wilms tumor occurs most often in very young children. The average age when it is found is about 3 to 4 years. It is not common in children after the age of 6.

Last Medical Review: 08/01/2012
Last Revised: 08/01/2012