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Immunohistochemistry showing tumor cells strongly reactive to vimentin (A), diffuse membranous immunostaining for CD56 in mesenchymal cells (B), diffuse multifocal cytoplasmic immunostaining with a distinct paranuclear dot-like staining using cytokeratin 19 (C), focal cytoplasmic positivity for desmin in some tumor cells (D), tumor cells focally positive for α-smooth muscle actin (E) and S100 (F) (EnVision+, × 400).
