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Related Experiment Videos

Sirenomelia associated with a "vanishing twin".

R P Kapur1, B S Mahony, D A Nyberg

  • 1Department of Pathology, University of Washington, Seattle 98195.

Teratology
|February 1, 1991
PubMed
Summary

A rare twin pregnancy case showed one fetus resorbed and the other with sirenomelia (mermaid syndrome). This suggests a stronger link between twinning and sirenomelia than previously thought.

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Area of Science:

  • Reproductive Medicine
  • Fetal Medicine
  • Medical Imaging

Background:

  • Twin gestations present unique challenges in prenatal diagnosis and management.
  • Sirenomelia, a rare congenital anomaly, involves the fusion of lower extremities.
  • The etiology of sirenomelia is complex, with potential links to vascular disruptions and genetic factors.

Observation:

  • A twin gestation was monitored, with one gestational sac noted to disappear in the first trimester.
  • The surviving fetus was diagnosed with sirenomelia via prenatal ultrasound.
  • Key sonographic findings included severe renal dysgenesis, fused lower extremities, and absent fibulae.

Findings:

  • Postmortem examination confirmed caudal dysgenesis and revealed a single umbilical artery originating from the abdominal aorta.

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  • The resorbed twin may have contributed to the vascular compromise leading to sirenomelia in the surviving twin.
  • Sirenomelia is observed more frequently in twin gestations compared to singleton pregnancies.

    • Implications:

    • This case highlights a potentially underestimated association between twinning and sirenomelia.
    • Further research is warranted to elucidate the mechanisms underlying this association.
    • Understanding these associations can improve prenatal counseling and management strategies for high-risk twin pregnancies.