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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.
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The estimated incidence is ~2 per 1000 pregnancies.
Some authors suggest that there is a higher prevalence of a succenturiate lobe in patients 8:
>35 years old
with a history of in vitro fertilization
It is 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).
Treatment and prognosis
increased incidence of type II vasa previa
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".
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:
isoechoic hematoma from a placental abruption
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- 2. Marino T. Ultrasound abnormalities of the amniotic fluid, membranes, umbilical cord, and placenta. Obstet. Gynecol. Clin. North Am. 2004;31 (1): 177-200. doi:10.1016/S0889-8545(03)00125-6 - Pubmed citation
- 3. Fadl S, Moshiri M, Fligner CL, Katz DS, Dighe M. Placental Imaging: Normal Appearance with Review of Pathologic Findings. Radiographics : a review publication of the Radiological Society of North America, Inc. 37 (3): 979-998. doi:10.1148/rg.2017160155 - Pubmed
- 4. Spirt BA, Kagan EH, Gordon LP et-al. Antepartum diagnosis of a succenturiate lobe: sonographic and pathologic correlation. J Clin Ultrasound. 1981;9 (3): 139-40. - Pubmed citation
- 5. Nelson LH, Fishburne JI, Stearns BR. Ultrasonographic description of succenturiate placenta. Obstet Gynecol. 1977;49 (1 suppl): 79-80. - Pubmed citation
- 6. Spirt BA, Gordon LP, Kagan EH. The placenta: sonographic-pathologic correlations. Semin Roentgenol. 1982;17 (3): 219-30. - Pubmed citation
- 7. Kimberly M. Rathbun, Jason P. Hildebrand. Placenta Abnormalities. (2019) Pubmed
- 8. Suzuki S, Igarashi M. Clinical significance of pregnancies with succenturiate lobes of placenta. (2008) Archives of gynecology and obstetrics. 277 (4): 299-301. doi:10.1007/s00404-007-0482-6 - Pubmed