case_images: PMC4397003_01
case_images: Intraoral picture showing growth in the lower left posterior region on lingual and distal aspect of 36.
case_images: CRID2015-243894.001.jpg
case_images: PMC4397003_01_CRID2015-243894.001.jpg
case_images: fig1
case_images: The growth was sessile, dark red in colour, firm in consistency, tender on palpation, and nonfluctuant (Figure 1).
case_images: Orthopantomograph showing no bony involvement.
case_images: CRID2015-243894.002.jpg
case_images: PMC4397003_01_CRID2015-243894.002.jpg
case_images: fig2
case_images: The orthopantomograph showed no bony involvement (Figure 2).
case_images: Intertwining bundles of spindle cells with abundant extracellular collagenous matrix (H&E stain, original magnification x40).
case_images: CRID2015-243894.003.jpg
case_images: PMC4397003_01_CRID2015-243894.003.jpg
case_images: fig3
case_images: The tumor was composed mainly of streaming and interlacing fascicles of spindle-shaped cells resembling fibroblasts or smooth muscle cells, suggesting myofibroblastic differentiations (Figure 3), and a few mitotic figures.
case_images: Groups of densely packed cells adjacent to angular hemangiopericytoma-like blood vessels (H&E stain, original magnification x40).
case_images: CRID2015-243894.004.jpg
case_images: PMC4397003_01_CRID2015-243894.004.jpg
case_images: fig4
case_images: In some areas, the lesional cells appeared to be round or polygonal and closely packed (Figure 4).
case_images: Bundles of lesional spindle cells intensely positive for alpha-smooth muscle actin (original magnification x40).
case_images: CRID2015-243894.005.jpg
case_images: PMC4397003_01_CRID2015-243894.005.jpg
case_images: fig5
case_images: Immunohistochemistry showed a positive reaction in the tumor cells for alpha-smooth muscle actin (alpha-SMA) (Figure 5) but no immunoreactivity for antibodies directed against CD34 (Figure 6).
case_images: Lesional cells are negative for CD34. Positive stain highlights the extensive vascular network of the lesion (original magnification x40).
case_images: CRID2015-243894.006.jpg
case_images: PMC4397003_01_CRID2015-243894.006.jpg
case_images: fig6
case_images: Immunohistochemistry showed a positive reaction in the tumor cells for alpha-smooth muscle actin (alpha-SMA) (Figure 5) but no immunoreactivity for antibodies directed against CD34 (Figure 6).