A large mass is seen in the retroperitoneum on the superior and lateral aspects of right kidney, which is displaced inferiorly. The mass is seen pushing the pancreatic head and IVC medially. Superiorly it is seen invaginating and scalloping the liver posteriorly with stretching of the portal vein. The mass appeared largely fatty with areas of higher attenuation inside. Density on CT varied between -15HU peripherally to -25HU in the center.