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Immunohistochemical findings. A. The myoid-appearing spindle tumor cells show diffuse and strong positivity for SMA (immunostaining, ×400). B. The primitive-appearing tumor cells are focally positive for SMA (immunostaining, ×400). C. The myoid-appearing spindle tumor cells show an increased Ki-67 labeling index (up to 7%) (immunostaining, ×400). D. The primitive-appearing tumor cells display low Ki-67 labeling index (up to 1%) (immunostaining, ×400).
