case_images: PMC7435328_01
case_images: Preoperative clinical picture showing 3 x 3cm swelling in the hard palate.
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case_images: PMC7435328_01_f1000research-9-25478-g0000.jpg
case_images: f1
case_images: A 59-year-old female patient presented to the outpatient clinic in the Oral and Maxillofacial Surgery Department, Cairo University in January 2019 complaining of a large painless swelling in the hard palate ( Figure 1).
case_images: Hematoxylin and eosin-stained sections showing epithelioid cells forming meningiothelial whorls (magnification, x100).. Indistinct cell membranes with uniform nuclei and no mitotic figures (inset; magnification, x200).
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case_images: f2
case_images: The cells exhibited round to oval nuclei ( Figure 2).
case_images: Hematoxylin and eosin-stained sections showing syncytial cells (magnification, x100).. Psammoma bodies seen between meningiothelial cells (inset), (x200).
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case_images: Psammoma bodies were also present ( Figure 3).
case_images: Meningioma tumor cells showing a positive cytoplasmic immunohistochemical reaction for (
  a) epithelial membrane antigen and (
  b) Vimentin (magnification, x200).
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case_images: PMC7435328_01_f1000research-9-25478-g0003.jpg
case_images: f4
case_images: Cells were positively stained using primary antibodies for epithelial membrane antigen (EMA) and vimentin ( Figure 4a, b), but were not stained when using primary antibodies for S100, pancytokeratin, p63, chromogranin and renal cell carcinoma glycoprotein ( Figure 5a-e).
case_images: Meningioma tumor cells react negatively following immunohistochemical staining for (
  a) renal cell carcinoma glycoprotein, (
  b) S100, (
  c) chromoginin, (
  d) p63, (
  e) PanCK (magnification, x100).
case_images: f1000research-9-25478-g0004.jpg
case_images: PMC7435328_01_f1000research-9-25478-g0004.jpg
case_images: f5
case_images: Cells were positively stained using primary antibodies for epithelial membrane antigen (EMA) and vimentin ( Figure 4a, b), but were not stained when using primary antibodies for S100, pancytokeratin, p63, chromogranin and renal cell carcinoma glycoprotein ( Figure 5a-e).