PMC8325585_01
Post contrast MRI demonstrates a well-defined homogeneously enhancing extra-axial dural-based mass in the left CP angle suspicious for an en plaque meningioma.
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MRI of the brain with and without contrast revealed a 2.6 x 2.1 cm well-defined homogeneously enhancing extra-axial dural-based mass at the left CP angle, which extended superiorly to the tentorium, suspicious for en plaque meningioma (Figure 1).
(a) Routine H&E stain demonstrates peripheral scattered meningothelial cells. (b) These meningothelial cells are highlighted by somatostatin receptor 2a immunohistochemistry.
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Focal meningothelial cells demonstrated by epithelial membrane antigen, progesterone receptor, and somatostatin receptor 2a immunohistochemistry were primarily present at the periphery (Figure 2).
(a) Routine H&E stain demonstrates the atypical lymphocytes. These lymphocytes are positive for CD20 (b) with increased Ki-67 proliferation index (c).
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The Ki-67 proliferation index was 20-30% (Figure 3).