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Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
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Amniotic sheets: Imaging features, subtypes, and obstetric outcomes.
Aileen Zhang1, Mara Rosner2, Marika Toscano2
1Johns Hopkins Medicine, Baltimore, USA. azhang59@jhmi.edu.
Abdominal Radiology (New York)
|December 9, 2025
Summary
Amniotic sheets, intrauterine membranes, can present differently on imaging. Specific features like compartmentalization may indicate obstetric risks, guiding delivery planning.
Area of Science:
- Reproductive Imaging
- Fetal Medicine
- Obstetrics
Background:
- Amniotic sheets (or shelves) are intrauterine membranes formed by amnion and chorion reflection.
- While not linked to fetal malformations, specific features may correlate with obstetric and fetal risks, including malpresentation.
Purpose of the Study:
- To evaluate ultrasound (US) and magnetic resonance (MR) imaging features of amniotic sheet subtypes.
- To correlate imaging findings with obstetric and fetal outcomes.
Main Methods:
- Pictorial review of four amniotic sheet cases.
- Analysis of distinct US and MR imaging characteristics.
- Comparison with other intrauterine echogenicities.
Main Results:
- Identified distinct US and MR imaging features for amniotic sheet subtypes.
- Demonstrated variations in location, orientation, compartmentalization, and discontinuities.
- Observed obstetric and fetal complications in rare cases with marked compartmentalization and discontinuities.
Conclusions:
- Thorough characterization of amniotic sheets via prenatal imaging aids patient counseling, surveillance, and delivery planning.
- Uterine compartmentalization and discontinuities are key features for evaluation.
- Three-dimensional (3D) US and MR imaging enhance characterization of amniotic sheet subtypes and extent.
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