Fig. 2
From: Primary Ewing’s sarcoma of the kidney: a rare masquerader of renal cell carcinoma on imaging
A Axial non contrast CT shows an isodense mass lesion in the upper pole of the left kidney with an eccentric focus of calcification (arrow). B Axial CECT in cortico-medullary phase shows a hypoenhancing mass lesion in the upper pole of the left kidney, with internal non-enhancing necrotic areas. C Axial CECT in nephrographic phase shows progressive enhancement of the mass lesion in the superior pole of the left kidney. There is extension of the lesion into the left crus of the diaphragm (white arrow) and a metastatic para-aortic node (red arrow). D Axial CECT in delayed phase shows further progressive enhancement of the mass, appearing almost isodense with the adjacent renal parenchyma