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  Indian J Med Microbiol
 

Figure 3: A case of Ewings/primitive neuroectodermal tumor with bone marrow infiltration (a) bone marrow aspiration smears showing rosettes and singly scattered round cells with scant cytoplasm and round nuclei with dispersed chromatin (×400) (b) bone marrow biopsy displaying paratrabecular pattern of infiltration by round cells (×400) (c and d) immunohistochemistry with CD99 showing membrane and cytoplasmic positivity and negativity with CD56 (×400)

Figure 3: A case of Ewings/primitive neuroectodermal tumor with bone marrow infiltration (a) bone marrow aspiration smears showing rosettes and singly scattered round cells with scant cytoplasm and round nuclei with dispersed chromatin (×400) (b) bone marrow biopsy displaying paratrabecular pattern of infiltration by round cells (×400) (c and d) immunohistochemistry with CD99 showing membrane and cytoplasmic positivity and negativity with CD56 (×400)