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Phyllodes Tumor : High-grade

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This specimen of high-grade phyllodes tumor shows a circumscribed tumor with areas of hemorrhage and necrosis. The sections showed infiltrative borders, stromal overgrowth with considerable cytologic atypia and frequent mitoses. The histologic features were those of sarcoma, NOS. Clear-cut distinction between benign and malignant phyllodes tumor may not always be possible.

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