Kidney Cancer Health Center
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Tumors in the kidney can be benign (not cancer) or malignant (cancer). Benign tumors are not as harmful as malignant tumors.
Malignant or cancerous tumors, though, can invade nearby tissue and spread to the lymph nodes and other areas of the body.
They can also spread through blood vessels to the lungs, bones or liver. After spreading, kidney cancer cells may attach to other tissues and grow to form new tumors that may damage those tissues. When cancer spreads, this is known as metastasis.