Fig. 4From: Bilateral collagenous fibroma of the hard palate: a case report and review of the literatureImmunohistochemical findings of the collagenous fibroma. A Tumor cells were strongly positive for vimentin (× 400). B Tumor cells were negative for beta-catenin (× 400). C Smooth muscle actin staining smooth muscle cells in blood vessels with no reaction in tumor cells (× 100). D CD34 staining endothelial cells of blood vessels with no reaction in tumor cells (× 100)Back to article page