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Types of kidney cancer

Renal cell carcinoma (RCC) is the most common type of kidney cancer. The cancerous cells typically develop in the lining of very small tubes in the kidney, called tubules. Over time, these cells may grow into a mass and cause an obstruction. The cancer may form in one or both kidneys.

Subtypes of RCC

Clear cell RCC accounts for approximately 80 percent of all renal cell carcinomas. The tumor cells appear very pale or clear when observed under a microscope.

Papillary RCC is the second most common type of RCC and accounts for 10-15 percent of kidney cancers. The cancerous cells develop finger-like projections in the tumor.

Chromophobe RCC, like clear cell RCC, has tumor cells that appear pale or clear under a microscope. However, cells related to this type of cancer tend to be larger in size.

Collecting duct RCC is a rare and aggressive type of RCC, accounting for less than one percent of kidney cancers. The cancerous cells form irregular tubes inside the tumor.

Unclassified RCC is another rare type of kidney cancer. These cells cannot be classified based on their appearance under a microscope. Alternately, cancers that have more than one subtype may be grouped in this category.

Other types of kidney tumors include:

Transitional cell carcinoma develops in the region where the kidney and the ureters join. The ureters are tubes that carry urine from the kidneys to the bladder. The tumor cells may begin to look more like bladder cancer cells than kidney cancer cells when observed under a microscope. This cancer type may also be referred to as urothelial cancer or renal pelvis carcinoma.

Renal sarcoma is a rare type of kidney cancer that develops in the connective tissue of the kidney.

Learn more about treatments for kidney cancer

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