A cancerous tumour of the kidney can spread, or metastasize, to other parts of the body. Cancerous tumours are also called malignant tumours. Different types of cancerous tumours can develop in different parts of the kidney.
Renal cell carcinoma (RCC) is the most common type of kidney cancer. It starts in the lining of the tubules of the kidney and is found most often in the cortex (the tissue in the body of the kidney). There are several types of RCC.