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Fetal Anatomic Imaging Between 11 and 14 Weeks Gestation.

Ingrid Liff1, Bryann Bromley

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Early fetal imaging at 11-14 weeks aids prenatal aneuploidy risk assessment by examining fetal anatomy. While about 50% of major abnormalities are detectable, this early evaluation has limitations and does not replace second-trimester screening.

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Area of Science:

  • Prenatal diagnostics
  • Fetal medicine
  • Medical imaging

Background:

  • First-trimester fetal imaging (11-14 weeks) is crucial for prenatal risk assessment of aneuploidy.
  • This gestational window allows for reliable examination of fetal anatomic structures.

Purpose of the Study:

  • To outline the capabilities and limitations of early fetal anatomic evaluation.
  • To inform healthcare providers and patients about the scope of first-trimester ultrasound screening.

Main Methods:

  • Utilizing a defined imaging protocol for fetal examination between 11 and 14 weeks gestation.
  • Assessing the detectability rates of major fetal abnormalities during this period.

Main Results:

  • Approximately 50% of major fetal abnormalities can be detected with a defined protocol.
  • The detectability of anomalies varies, with some consistently identified, some occasionally, and others not at all.

Conclusions:

  • Familiarity with embryology and anomaly natural history is essential for accurate interpretation.
  • Early anatomic evaluation has limitations and does not substitute for standard second-trimester assessments.