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Hematoxylin and eosin and immunohistochemical staining of the breast tumor specimen. a) Hematoxylin and eosin staining of the breast tumor specimen shows a delicately encapsulated mass comprising fibrous and adipose tissue (Original magnification × 50). b-d) Immunohistochemical staining for smooth muscle actin, desmin, and HHF35 shows the smooth muscle histogenesis of stromal spindle cells (Original magnification × 150).
