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Updated: Jul 14, 2026
05:40
Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs
Published on: December 22, 2023
Intrathoracic fluid may be a normal finding at around 8 gestational weeks
Summary
Early embryonic thoracic fluid, observed around 8 weeks gestation, appears to be a transient pericardial collection. This finding resolved by week 12 and was associated with normal fetal development and birth outcomes.
Area of Science:
- Embryology
- Fetal Medicine
- Diagnostic Ultrasound
Background:
- Pericardial fluid collections in early gestation can be a diagnostic challenge.
- Understanding transient fluid collections is crucial for accurate fetal assessment.
Purpose of the Study:
- To describe the ultrasound observation of embryonic thoracic fluid around 8 weeks' gestation.
- To investigate the etiology and clinical significance of this early finding.
Main Methods:
- Retrospective analysis of ultrasound scans from 6-10 weeks gestation.
- Inclusion criteria: embryos with anechoic fluid collection surrounding the heart.
- Data collected: gestational age, fetal heart rate, maternal age, nuchal translucency, and second-trimester scan results.
Main Results:
- Five cases of early pericardial fluid collection were identified at 8 weeks gestation.
- The fluid collection resolved completely by the 12-week nuchal scan.
- All cases showed normal nuchal translucency, normal second-trimester cardiac examinations, and normal birth outcomes.
Conclusions:
- The observed anechoic fluid collection is likely a transient pericardial effusion.
- This finding, when resolving by 12 weeks, is not associated with adverse fetal outcomes.
- Early identification and follow-up are key for reassuring parents and clinicians.
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