case_images: PMC8256239_01
case_images: CT Imaging of oropharyngeal area. Well-limited formation along the posterior part of
  the oropharynx, behind the uvula from which it is inseparable, measuring
  21 mm x 9 mm x 20 mm. No signs of infiltration and penetration through the oropharyngeal
  wall are seen.
case_images: 10.1177_20363613211026483-fig1.jpg
case_images: PMC8256239_01_10.1177_20363613211026483-fig1.jpg
case_images: fig1-20363613211026483
case_images: No signs of infiltration to prevertebral tissue nor progression to parapharyngeal or retropharyngeal space were seen (Figure 1).
case_images: Gross pathological sample of tumor. Elevated, partially ulcerated nodul, approximately
  2 cm in diameter, in the mucosa of 83-year-old man.
case_images: 10.1177_20363613211026483-fig2.jpg
case_images: PMC8256239_01_10.1177_20363613211026483-fig2.jpg
case_images: fig2-20363613211026483
case_images: Macroscopic examination of the excised tissue revealed a mucosal sample with ulcerative nodule, measuring 2.5 cm x 2 cm x 1 cm (Figure 2).
case_images: Microscopic pathological slides of tumor. Undifferentiated pleomorphic sarcoma in
  oropharyngeal mucosa of an 83 year-old man. Elevated nodul composed of pleomorphic,
  mostly spindle-shaped cells with some intervening collagen covered with normal squamous
  epithelium (a). On higher magnification a polymorphic cells, an atypical epitheloid
  tumor cells with large, vesicular, and hyperchromatic nuclei, with atypical mitosis and
  occasional tumor multinuclear giant cells (b). Well delineated nodul on the base of
  tumor in lamina propria with sparing the muscular layer (c). By immunohistochemistry
  tumor cells were negative with epithelia marker (pan cytokeratin, AE1/AE3) (d), focally
  positive with CD68 (e), and strongly positive for CD10 (f).
case_images: 10.1177_20363613211026483-fig3.jpg
case_images: PMC8256239_01_10.1177_20363613211026483-fig3.jpg
case_images: fig3-20363613211026483
case_images: The tumor was strongly diffuse positive for Vimentin and CD10, focally positive for CD68, CD99, and Bcl-2, and negative for all other markers (Figure 3).