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Microscopic examination showed a triphasic malignant neoplasm composed of blastema, epithelial elements, and myxoid stroma with immature spindle cells (H&E – A: 40X, B: 100X, C: 400X). Neoplastic cells exhibited moderate nuclear pleomorphism, individual cell necrosis and numerous mitoses. These cells stained diffusely positive for WT1 (D) and CD56 (E), and focally for P53 (F).
