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Figure 1: (a) Magnetic resonance imaging: Bilobed intracranial extradural heterogeneously enhancing mass lesion in right parietal region (b) Gross: Soft gray-brown with areas of hemorrhage. External surface; glistening encapsulated (inset) (c) Small round cell sheets with intervening vascular channels (H and E, ×100) (d) Monotonous tumor cells with indistinct cytoplasm, vesicular nuclei, and clumped chromatin (H and E, ×400). Focal intracytoplasmic glycogen (PAS stain) (e) Interphase FISH with the ESWR1 (22q12) break-apart probe. Fused red/green signal indicate ESWR1 gene rearrangement. CD99 immunostain positive (inset)

Figure 1: (a) Magnetic resonance imaging: Bilobed intracranial extradural heterogeneously enhancing mass lesion in right parietal region (b) Gross: Soft gray-brown with areas of hemorrhage. External surface; glistening encapsulated (inset) (c) Small round cell sheets with intervening vascular channels (H and E, ×100) (d) Monotonous tumor cells with indistinct cytoplasm, vesicular nuclei, and clumped chromatin (H and E, ×400). Focal intracytoplasmic glycogen (PAS stain) (e) Interphase FISH with the ESWR1 (22q12) break-apart probe. Fused red/green signal indicate ESWR1 gene rearrangement. CD99 immunostain positive (inset)