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Amniotic sheets: natural history and histology
E Stamm1, G Waldstein, D Thickman
1Department of Radiology, University of Colorado Health Sciences Center, Denver 80262.
Summary
Amniotic sheets, identified via obstetric ultrasound, are multi-layered membranes potentially linked to prior pregnancy losses. These structures do not appear to cause fetal anomalies.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Diagnostic Ultrasound
Background:
- Amniotic sheets are sonographic findings observed during pregnancy.
- Their composition and clinical significance require further elucidation.
Purpose of the Study:
- To describe the sonographic characteristics and layered composition of amniotic sheets.
- To investigate the association between amniotic sheets and pregnancy outcomes.
Main Methods:
- Retrospective and prospective review of obstetric ultrasound findings.
- Detailed sonographic measurements and descriptive analysis of amniotic sheets.
- Correlation with pregnancy history and fetal anomaly data.
Main Results:
- Eleven cases of amniotic sheets were identified, characterized as single, planar reflective membranes.
- Histological evidence suggests a four-layered structure: amnion-chorion-chorion-amnion.
- Mean thickness was 2.4 mm (midportion) and 4.5 mm (free edge), with a frequent thick triangular base.
- Amniotic sheets showed minimal changes during gestation and were less identifiable late in pregnancy.
- No association was found between amniotic sheets and fetal anomalies.
- A significant incidence of previous spontaneous or therapeutic abortions was noted in mothers with amniotic sheets.
Conclusions:
- Amniotic sheets are distinct sonographic structures with a specific layered composition.
- Their presence is not linked to fetal anomalies but may be associated with a history of pregnancy loss.