ERG and neoplasm: IHC revealed that the innermost and outer cells in the vessels, irrespective of size (Figure 3a,b: larger vessels, Figure 3c,d: smaller vessels), were positive for ERG (Figure 3a,c) and alpha SMA (aSMA) (Figure 3b,d), respectively, consistent with the immunophenotypes of endothelial and smooth muscle cells (or pericytes), whereas DDLPS tumor cells surrounding the atypical vessels were only focally positive for these markers (Figure 3a–d).