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Mixed mesodermal tumours of the ovary are very rare: they occur more commonly in the uterine body, and even in this situation they are rare. They are closely allied to carcinosarcomas and differ only in containing heterologous elements as well. The majority appear to arise de novo, and a minority arise in preexisting foci of endometriosis; most of the patients are nulliparous and postmenopausal. The prognosis is uniformly poor and is not appreciably altered by treatment.
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Noel P. Orchard (1972) studied this question.
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