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A, Photograph showing microscopically markedly atypical spindle cells arranged in fascicles with brisk mitotic activity including atypical forms. Scattered tumor giant cells and epithelioid cells are also present (200×, H&E). B, Photograph showing other areas show more sheet-like growth with elongated and polygonal cells. Tumor giant cells and atypical mitotic figures are conspicuous (400×, H&E).
