case_images: PMC6329027_01
case_images: Preoperative view showing columellar widening and hypervascularity of the columellar skin.
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case_images: On physical examination, she showed partial obstruction of both nostrils due to widening of the nasal columella as well as hypervascularity of the columellar skin (Figure 1).
case_images: Contrast-enhanced computed tomography scan showing a heterogeneous soft-tissue mass without contrast enhancement (white arrow) around the anterior nasal spine. ((a): axial and (b): coronal).
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case_images: The contrast-enhanced computed tomography (CT) scan revealed heterogeneous soft-tissue density without enhancement in the front of anterior nasal spine and no invasion of the structures surrounding the mass (Figure 2).
case_images: Intraoperative view of the tumor after gingivolabial incision was performed, showing a well-encapsulated mass.
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case_images: A soft, well-encapsulated mass was observed under mucosa, which showed no adhesions to the surrounding structures (Figure 3).
case_images: (a) Histopathologic photomicrograph demonstrating a high density of cellular spindle-shape cells with hyperchromatic nuclei (hematoxylin and eosin, x200) and (b) immunohistochemical stain showing positivity for S-100 protein.
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case_images: The Antoni A region was composed of spindle-shape cells with hyperchromatic nuclei (Figure 4(a)). Immunohistochemical staining showed that the tumor was positive for S-100 (Figure 4(b)) but negative for smooth muscle actin.