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Histological and immunohistochemical showing that the mass appears as gray-white tissue. Tumor cells are elongated, spindle-shaped, non-pleomorphic, arranged in bundles and palisades, with areas of interstitial degeneration and edema. Immunohistochemistry results: S100 (diffuse +), CD34 (-), EMA (focal +), Vimentin (+), CK (pan) (-), SMA (partial +), Actin (focal +), Desmin (-), Ki-67 (1% +).
