There is diffuse retroperitoneal soft tissue infiltrating mass lesion, associated with bilateral perirenal soft tissue thickening. There is very minimal subcapsular renal fluid and stranding of the Gerota's fascia fat plane giving the appearance of hairy kidneys. The thickening mainly involves the major retroperitoneal vessels such as the superior mesenteric, renal vessels, and inferior mesenteric artery. It also surrounds the abdominal aorta. The thickening extends to surround the mesenteric branches of the superior mesenteric artery as well as the root of mesentery. However, despite the vascular encasement, there is no intraluminal filling defect.
Note: multiple hepatic cysts.