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A rare, high grade sarcoma that arises from the endometrial stroma or myometrium without a specific type of differentiation. It was previously also known as high grade endometrial stromal sarcoma. In 2014, high grade endometrial stromal sarcoma was reclassified and is currently considered a distinct and rare neoplasm. Undifferentiated uterine sarcoma has a worse prognosis.
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