When young children receive a kidney cancer diagnosis, it's often a kind called Wilms' tumor, also referred to as nephroblastoma. This type of cancer is possible but rare in adults. It is usually unilateral, meaning it is present in only one kidney for the most part, but up to 10% of kids with Wilms tumors have them in both kidneys. The tumors grow to be large but are often found before they can spread to other parts of the body. Around 10% of Wilms tumors have cancer cells that look especially odd and are spread throughout the tumor (diffuse anaplasia), which makes them harder to treat.

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