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SUCCENTURIATE
PLACENTA BILOBATE PLACENTAE |
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SUCCENTURIATE
PLACENTA |
Succenturiate lobes of the placenta result from focal areas of non-involution of the chorionic laeve.
One or more accessory lobes are developed in the membranes at a distance from the periphery of the main placental mass.
Vascular connections of fetal origin usually connect the main placental mass to the succenturiate lobe. These accessory lobes may be single or multiple of varying size.
- Incidence. ± 3% - 8% (1).
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Case 1 |
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Case 2 |
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COMPLICATIONS
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- Retention of the accessory lobe after expulsion of the main placental mass resulting in serious hemorrhage.
- Implantation of the accessory lobe over the internal cervical os.
- Hemorrhage from the vessels connecting the succenturiate lobe to the main placental mass.
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BILOBATE
PLACENTAE |
- Bilobate placentae consist of two lobes of approximately equal size Can rarely have three or more lobes).
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- Found in < 4% of pregnancies.
- Placental lobes appear as two well defined masses connected by a thin bridge of chorionic tissue.
- Cord is usually attached at this bridge of tissue.
- Usually of no clinical significance, but may be associated with velamentous insertion of the cord (which must be looked for and excluded prior to the onset of labor).
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Bilobed placenta |
Succenturiate placenta |
Placental lobes
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Equal
size |
Different
size |
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Cord attachment |
Central |
Eccentric
velamentous |
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Placenta lobes attached by: |
Placental
/ chorionic tissue |
Membranes |
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Complications |
Occasionally
velamentous cord insertion |
Retained
products Velamentous attachment Vasa previa Hemorrhage
from vessels attaching main placental mass to succenturiate
lobe |
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REFERENCES
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- Jeanty P, Kirkpatrick C, Verhoogen C et.al. The succenturiate placenta. J Ultrasound Med 1983;2:9-12.
- Spirt BA, Kagan EH, Gordon LP et.al. Antepartum diagnosis of a succenturiate placenta: sonographic and pathologic correlation. J Clin Ultrasound 1981;9:139-140.