Zonary placenta
Last revised by David Luong on 6 Feb 2022
Citation, DOI, disclosures and article data
Citation:
Weerakkody Y, Luong D, Zonary placenta. Reference article, Radiopaedia.org (Accessed on 10 Oct 2024) https://doi.org/10.53347/rID-92241
rID:
92241
Article created:
17 Aug 2021,
Yuranga Weerakkody ◉
Disclosures:
At the time the article was created Yuranga Weerakkody had no recorded disclosures.
View Yuranga Weerakkody's current disclosures
Last revised:
6 Feb 2022,
David Luong ◉
Disclosures:
At the time the article was last revised David Luong had no recorded disclosures.
View David Luong's current disclosures
Revisions:
3 times, by
2 contributors -
see full revision history and disclosures
Synonyms:
- Ring shaped placenta
- Annular placenta
A zonary placenta also known as a ring-shaped placenta or annular placenta is an extremely rare variation in placental morphology where the placenta can appear as an annular ring. It can be a complete ring of placental tissue, but more often, tissue atrophy to part of the ring can result in a horseshoe shape placenta.
Epidemiology
Reported incidence is less than 1 in 6000 1.
Complications
The ring-shaped placenta can cause antepartum and postpartum bleeding, as well as fetal growth restriction 3.
References
- 1. Živković N, Krezo S, Matijević R, Živković K. Vaginal delivery through annular placenta -- case report. (2013) Croatian medical journal. 54 (2): 203-5. doi:10.3325/cmj.2013.54.203 - Pubmed
- 2. Steemers NY, De Rop C, Van Assche A. Zonary placenta. (1995) International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics. 51 (3): 251-3. doi:10.1016/0020-7292(95)80020-4 - Pubmed
- 3. Kimberly M. Rathbun, Jason P. Hildebrand. Placenta Abnormalities. (2020) Pubmed
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