Fig. 4From: Primary Ewing’s sarcoma of the kidney: a rare masquerader of renal cell carcinoma on imagingA Hematoxylin and eosin stained section (40×) shows tumor cells arranged in sheets with hyperchromatic nuclei and scant cytoplasm. B On Immunohistochemistry, tumor cells are positive for CD99. C The tumor cells are negative for leukocyte common antigen (LCA), synaptophysin and chromograminBack to article page