Succenturiate lobe

A succenturiate lobe (SL) 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.

Radiographic features

Antenatal ultrasound

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 haemorrhage due to retained placental tissue 5

History and etymology

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

Differential diagnosis

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

For a focal area of increased thickening on ultrasound also consider

See also

Ultrasound - obstetric

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