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.

Epidemiology

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

Pathology

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

Radiographic features

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.

Complications

  • it carries an increased incidence of type II vasa previa
  • it may increase the incidence of postpartum 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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Article Information:

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