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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
PubMed
Summary
This summary is machine-generated.

Amniotic sheets, intrauterine membranes, can present differently on imaging. Specific features like compartmentalization may indicate obstetric risks, guiding delivery planning.

Keywords:
Amniotic sheetAmniotic shelfIntrauterine adhesionSynechiae

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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.