Succenturiate lobe
A succenturiate lobe is a variation in placental morphology and refers to a smaller accessory placental lobe that is separate to the main disk of the placenta. There can be more than one succenturiate lobe.
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Epidemiology
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 disk. 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 praevia).
Complications
- increased incidence of type II vasa praevia
- increased incidence of postpartum hemorrhage 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 the 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
- focal myometrial contraction
- isoechoic hematoma from a placental abruption
Related Radiopaedia articles
Ultrasound - obstetric
- ultrasound (introduction)
- obstetric ultrasound
- first trimester and early pregnancy
- ectopic pregnancy
- multiple gestations
- subchorionic hematoma
- failed early pregnancy
-
second trimester
- fetal biometry
- fetal morphology assessment
- fetal echocardiography views
- nonvisualisation of the fetal stomach
-
soft markers
- nuchal fold thickness
- ventriculomegaly
- absent nasal bone
- choroid plexus cysts
- enlarged cisterna magna
- shortened fetal long bones
- echogenic intracardiac focus (EIF)
- echogenic fetal bowel
- aberrant right sublavian artery
- fetal pyelectasis / fetal renal pelvic dilatation
- single umbilical artery
- sandal gap toes
- amnioreduction
- Doppler ultrasound
- nuchal translucency
- 11-13 weeks antenatal scan
- chorionic villus sampling (CVS) and amniocentesis
- placenta
- other
Placental pathology
-
placenta
- placental anatomy
- placental developmental abnormalities
- placenta previa
- spectrum of abnormal placental villous adherence
- abnormalities of cord insertion
- abruptio placentae
- placental pathology
- vascular pathologies of placenta
- placental infections
- placental masses
- molar pregnancy
- twin placenta
- miscellaenous
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