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Bilobed placenta

Dr Henry Knipe ◉ ◈ and Dr Yuranga Weerakkody ◉ et al.

A bilobed placenta also referred 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.

On this page:

Article:

Epidemiology
Pathology
Radiographic features
Complications
Differential diagnosis
References

Images:

Cases and figures
Imaging differential diagnosis

Epidemiology

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

Pathology

It is thought to result from localized placental atrophy as a result of poor dedicualisation or vascularization of a part of the uterus (dynamic placentation theory) ⁵.

Associations

velamentous insertion of the cord

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 hemorrhage due to retained placental tissue

Differential diagnosis

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

succenturiate lobe: accessory lobe(s) smaller in size than the main lobe
twin pregnancy with two placentas

References

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

Figure 1: bilobed placentaFigure 1: bilobed placenta

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