case_images: PMC4898417_01
case_images: Magnetic resonance imaging of the spine demonstrating a mass located in the C7 epidural space (arrow).
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case_images: Magnetic resonance imaging (MRI; Figure 1) confirmed the presence of an extradural lesion at the spinal C7 level.
case_images: Axial (A) and sagittal (B) magnetic resonance imaging of the brain showing two extra-axial intracranial masses in the bilateral frontal regions.
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case_images: Further brain MRI evaluations (Figure 2) showed two extramedullary meningioma-like masses with bone involvements and frontal brain parenchymal compressions.
case_images: Hematoxylin and eosin staining (A) showing small round blue cells with a high nuclear-to-cytoplasmic ratios, and immunostaining (B) demonstrating positivity for CD99. Magnification x100.
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case_images: Upon microscopic analyses of hemotoxylin and eosin stained sections, the neoplasm displayed monotonous, closely packed small round blue cells with high nuclear-to-cytoplasmic ratios (Figure 3A). Using immunohistochemical analyses, the cells strongly expressed CD99 (Figure 3B), vimentin, and Bcl-2.