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(A) Photomicrograph showing numerous anaplastic astrocytic tumor cells with mitosis, large multinucleated giant cells with abundant eosinophilic cytoplasm, and an extensive area of necrosis. (B) Photomicrograph of the immunohistochemical study showing a positive reaction for the glial fibrillary acidic protein (GFAP) (A: hematoxylin and eosin stain, original magnification, ×100, B: original magnification, ×200).
