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a, b Lower and high power views of tumor with central necrosis (arrow), c, d fascicles of spindle tumor cells with necrosis and brisk abnormal mitoses (arrow and insert), e prominent nuclear pleomorphism and f strong diffuse positivity for smooth muscle actin (SMA). (H&E stain: a ×10, b ×40, c ×20, d ×40, e ×40 and f, peroxidase-antiperoxidase immunostain with anti-SMA ×20)
