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Section of the tumor in Case 2 showing spindle-shaped sarcomatous components grow around the thick-walled vessel; outside the sarcomatous cells is glial components (A: H&E, original ×40). The glial cells have gemistocytic morphology (B: H&E, original ×300). Immunohistochemical staining for EGFR demonstrates positivity in tumor cells (C: EGFR, ×300).
