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The gross specimen (A) and the histologic result (B:ross specimen (A) showed a 7 cm × 8 cm × 8 cm mass in the central region with clear boundary, regular shape, and pectoralis major invaded, and the histologic result (B: HE×40) showed that it was rich in osteoid tissues, heteromorphic osteoblast-like cells, and multinucleated giant cells.
