Bilobed placenta

A bilobed placenta, also referred as bipartite placenta, is a variation in placental morphology and refers a placenta separated into two near equal lobes. If more than two lobes are present, it is termed a trilobed, four-lobed and so on.

The estimated incidence is at up to ~4% of pregnancies.

It is thought to result from localised atrophy as a result of poor dedicualisation or vascularisation of a part fo the uterus (dynamic placentation theory) 5.

Associations
Antenatal ultrasound

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 which bridges the two lobes. Less commonly the cord may insert into one of the lobes.

  • it carries an increased incidence of type II vasa previa
  • it may increase the incidence of postpartum haemorrhage due to retained placental tissue

If more than one lobe of placenta is seen in an antenatal scan consider:

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Article Information

rID: 13452
System: Obstetrics
Synonyms or Alternate Spellings:
  • Bipartite placenta
  • Bilobate placenta
  • Duplex placenta
  • Placentae bilobata

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Cases and Figures

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    Bilobed placenta
    Diagram : bilobed placenta
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