SMN1 and neoplasm: IHC staining further confirmed tumor's smooth muscle and mesenchymal origins, with positive for vimentin (Figure 3A), smooth muscle antibody (SMA, Figure 3B), synapsin (Syn, Figure 3C), actin (Figure 3D), desmin (Figure 3E), CD34 (vascular, Figure 3F), while negative for and chromogranin A (CgA, Figure 3G).