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Hematoxylin and eosin (H&E) stain (×400 magnification) section showed that the tumor consisted of interlacing, fascicular proliferated spindle-shaped tumor cells and fibrocollagenous stroma (a). Rhabdomyoblast-like cells with cellular atypia were occasionally observed (b). On immunohistochemistry, desmin (c) and myogenin (d) were positive.
