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Hematoxylin and eosin staining showed spindle and fusiform cells with eosinophilic cytoplasm and a myxoid and cartilaginous matrix (AandB). Immunohistochemistry for S100 (C) and SOX9 (D) was positive. Brachyury staining (E) was negative. The Ki-67 labeling index was < 1% (F). Original magnification ×40 (A) and ×400 (B–F).
