Table 1. Immunohistochemistry report consistent with Ewing's Sarcoma.

IHC Markers	Results
CD 45	Non-immunoreactive, score 0 in neoplastic cells
Vimentin	Immunoreactive, score 4+ in neoplastic cells
CD 99	Immunoreactive, score 4+ in neoplastic cells
Desmin	Non-immunoreactive, score 0 in neoplastic cells
FLI-1	Immunoreactive, score 3+ in neoplastic cells
Ki-67	Immunoreactive in 50-60% of neoplastic cells