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Postoperative pathological and immunohistochemical staining results. 2A Mass specimen. 2B Microscopically, the mass was composed of mononuclear stromal cells and osteoclast-like giant cells. HE 400×. 2Creactive/metaplastic bone formation were seen around the lesion. HE 100×. 2DTumor cells were negative for H3.3G34W. IHC 100×.
