The authors describe 4 cases of hydatidiform mole with a live fetus delivered between 20 and 22 weeks gestation. The ultrasound and clinical findings and the pathological classification are discussed. In 2 patients the mole completely replaced a separate placenta in a multiple gestation; in the other 2, the mole partially replaced a solitary placenta.
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Sauerbrei et al. (1980) studied this question.