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Metastasis of an undifferentiated fetal soft tissue sarcoma to the maternal compartment of the placenta: maternal aspects, pathology findings and review of the literature on fetal malignancies with placenta metastases

Sir: Cancers in pregnancy affect approximately 0.1% of all pregnant women, and the large majority are of maternal origin. While more than 50 cases of maternal cancers with metastases to the placenta and 14 cases of transplacental transmission to the fetus have been reported, primary fetal malignancies with placental involvement are extremely rare. We report the first case of an undifferentiated fetal soft tissue sarcoma involving the maternal compartment of the placenta with metastases to the chorionic villi and the intervillous space, and review all documented cases of fetal malignancies with metastases to the placenta or to the mother.