Succenturiate lobe
Dr Abhilash Sandhyala and Dr Yuranga Weerakkody et al.
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 lobes.
Epidemiology
The estimated incidence is thought to be at around 2 per 1000 pregnancies.
Radiographic features
Antenatal ultrasound
May be seen as a smaller separate lobe of similar echotexture to the main placental disc.
Complications
- it carries an increased incidence of type II vasa previa
- it can also increase the incidence of post partum haemorrhage due to retained placental tissue 5
Etymology
The term succenturiate derives from the latin word "succenturio" meaning "to substitute".
Differenetial diagnosis
If more than one lobe of placenta is confidently seen in an antenatal scan consider
- bilobed placenta : two lobes are usually of similar size
- twin pregnancy with two placentas
For a focal area of increased thickening on ultrasound also consider
- iso-echoic haematoma from a placental abruption
- focal myometrial contraction
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