Figure 6.

Immunohistochemical features. (A) Diffuse and strong CD34 immunopositivity. (B) Negative CD68 antigen staining. (C) Positive bcl-2 antigen staining. (D) Negative CD99 antigen staining. (E). Diffusely negative S-100 staining. (F) Negative smooth-muscle actin.(G) 3-5% positive Ki-67 antigen staining. (H) Negative cytokeratin antigen staining. (I) Positive vimentin antigen staining. (J) Negative synaptophysin antigen staining. (K) Negative calretinin. (L) Negative Desmin antigen staining. (M) Negative CD31 antigen staining.