Immunohistochemically, tumor cells were diffusely positive for Vimentin and CD99 (Fig. 2e), focal positive for CD34 (Fig. 2f), Bcl-2 (Fig. 2g) and Actin, negative for CK, EMA, Desmin, CD117, GFAP, PR and S-100. Here, CD99 is linked to neoplasm.