CD99 and neoplasm: Sheets of small round cells with enlarged round to oval nuclei, fine stippled chromatin, PAS positive clear cytoplasm. Areas of necrosis with focal peritheliomatous proliferation of tumor cells around the blood vessels, increased mitosis, nuclear moulding were noted. In some areas, tumor islands were surrounded by desmoplastic stroma. CD99 positive, while cytokeratin (CK), desmin, synaptophysin (SYP), and chromogranin (CHR) were negative