Fat-containing renal mass

The kidneys are two reddish-brown bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about 12 centimetres (4 1⁄2 inches) in length. [Source: Wikipedia ]

Synonyms
Renal mass with fat
May Be Caused by
 Common
Angiomyolipoma
 Uncommon
Lipoma
Liposarcoma
Renal cell carcinoma
Teratoma
Wilms tumor
Xanthogranulomatous pyelonephritis