Diploid fetus with partially triploid placenta: case presentation and management strategy

Abstract Multiple placental cysts are a common finding in obstetric ultrasound imaging. Although it has benign differential diagnoses such as hydropic degeneration of the placenta or placental mesenchymal dysplasia, its important pathologies such as benign gestational trophoblastic disease or hydatiform mole should always be considered. A challenging issue in obstetrics is pregnancies with a placenta that has a bipartite texture. This means that one side of the placenta is normal, but the other side is full of cystic formation and just one fetus is visualized. The main critical concern is the presence of molar pregnancy because of its catastrophic consequences. Here we report a rare case in which the gravid uterus had a normal diploid fetus but had a bipartite placenta which was triploid in the hydropic part, revealing a unique genetic pattern.