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Bilobed placenta

A bilobed placenta (or bipartite placenta) is a variation in placental morphology and refers a placenta seperated into two near equal lobes. If more than two lobes are present it is termed a tri lobed / four lobed and so on.

Epidemiology

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

Pathology

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

Associations

Radiographic features

Antenatal ultrasound

May be sonographically seen as two seprate placental discs of near 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.

Complications

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

Differential diagnosis

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

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