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Malignant mesenchymal tumor, i.e., sarcoma, resembling giant cell tumor of bone and soft tissue. This tumor is made up of numerous osteoclastic‐type multinucleated giant cells in a background of malignant mononuclear cells (a,b). The mononuclear cells exhibit focal marked pleomorphism and increased mitoses (c). The tumor cells are strongly positive for vimentin (d), and negative for TTF‐1 and CK5/6. (x100).
