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Histologic sections reveals some vague papillary prolfierations of epithelioid cells with recent hemorrhage and fibrinous materials. The peripheral portions shows fibroblastic proferations with some metaplastic bone formation (H&E, ×40) (A). In high power view, there are vague papillary configurations of epitheloid endothelial cells with occasional distictive nucleoli and vesicular nuclei (H&E, ×40) (B). CD31 stain reveals positive reaction for tumor cells (C).
