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Related Experiment Videos

Fetal bifid sacrum artifact: normal developmental anatomy simulating malformation

M A Kliewer1, B S Hertzberg, P George

  • 1Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.

Radiology
|June 1, 1995
PubMed
Summary

The bifid sacrum, often seen in fetal sonography, is not a true anomaly but a normal anatomical variation. This finding typically appears after 20 weeks gestation and is related to ossification centers.

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Area of Science:

  • Fetal imaging
  • Embryology
  • Prenatal diagnosis

Background:

  • A bifid sacrum configuration is occasionally observed during routine fetal sonography.
  • Distinguishing true anomalies from normal anatomical variations is crucial in prenatal diagnosis.

Purpose of the Study:

  • To investigate the clinical significance of the bifid sacrum.
  • To determine the developmental origin of the bifid sacrum configuration.

Main Methods:

  • Retrospective review of 24 fetuses with apparent bifid sacrum.
  • Prospective sonographic evaluation of 111 fetuses.
  • Cadaveric imaging to assess sacral anatomy.

Main Results:

  • All 22 fetuses with available outcome data were normal.

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  • The bifid sacrum configuration was reproducible in 75/111 fetuses after 20 weeks gestation.
  • Cadaveric studies indicated the configuration relates to the demonstration of sacral alar ossification centers.

    • Conclusions:

    • The bifid sacrum is an artifactual representation of normal fetal anatomy.
    • This finding should not be mistaken for a congenital anomaly.