Succenturiate lobe

Last revised by Andrew Murphy on 31 Jul 2022

A succenturiate lobe is a variation in placental morphology and refers to a smaller accessory placental lobe that is separate to the main disc of the placenta. There can be more than one succenturiate lobe.

The estimated incidence is ~2 per 1000 pregnancies. Some authors suggest frequency of maternal age > 35 years and history of using in vitro fertilization having higher prevalences of succenturiate lobes 8

Seen as a smaller separate lobe of similar echotexture to the main placental disc. It is important to establish the location of any connecting vessels, and in particular to look for any vascular connection crossing the internal os (i.e. vasa previa).

  • increased incidence of type II vasa previa
  • increased incidence of postpartum hemorrhage due to retained placental tissue 5

The term "succenturiate" derives from the Latin word "succenturio" meaning "to substitute".

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

For a focal area of increased thickening on ultrasound also consider

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Cases and figures

  • Figure 1: diagram - single succenturiate lobe
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  • Case 1
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  • Case 2
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