To understand more about kidney cancer, it helps to know about the kidneys and what they do.
The kidneys are a pair of bean-shaped organs, each about the size of a fist.
They are attached to the upper back wall of the abdomen and protected by the lower rib cage.
When seen under a microscope, the cells that make up clear cell RCC look very pale or clear.Renal sarcoma: renal sarcomas are a rare type of kidney cancer that begin in the blood vessels or connective tissue of the kidney. Sarcomas are discussed in more detail in Sarcoma- Adult Soft Tissue Cancer. This means they do not metastasize (spread) to other parts of the body, although they can still grow and cause problems.