Contrast-enhanced computed tomography shows a large, bizarre-appearing mass in the posterior abdomen (arrow) that is displacing the right kidney (K), liver (L), ascending colon (C), small bowel (B), and mesentery (M). There is scalloping of the right renal outline, but no defect is seen in the renal parenchyma. The mass is composed predominantly of fat with large areas of soft tissue (asterisk). A few septa course through it. Some calcifications are present (arrowhead). No large vessels traverse the mass.