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A bilobed placenta also referred to as bipartite placenta, is a variation in placental morphology and refers to a placenta separated into two near equal-sized lobes. If more than two lobes are present, it is termed a trilobed, four-lobed, and so on. If the second lobe is smaller than the main lobe (with the umbilical cord insertion), then the smaller lobe is termed a succenturiate lobe.
The estimated incidence is at up to ~4% of pregnancies.
It is thought to result from localized placental atrophy as a result of poor decidualisation or vascularization of a part of the uterus (dynamic placentation theory) 5.
May be sonographically seen as two separate placental discs of nearly equal size. The cord usually attaches to a thin connecting rim of chorionic tissue that bridges the two lobes. Less commonly the cord may insert into one of the lobes.
Treatment and prognosis
it carries an increased incidence of type II vasa previa
it may increase the incidence of postpartum hemorrhage due to retained placental tissue
If more than one lobe of the placenta is seen in an antenatal scan consider:
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