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Related Experiment Videos

Sirenomelia and anencephaly.

J I Rodríguez1, J Palacios, S Razquin

  • 1Department of Pathology, La Paz Hospital, Madrid, Spain.

American Journal of Medical Genetics
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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This study details a rare case of sirenomelia and anencephaly in a monozygotic twin, a condition documented only twice previously. The affected twin also exhibited multiple severe congenital anomalies.

Area of Science:

  • Developmental Biology
  • Teratology
  • Medical Genetics

Background:

  • Sirenomelia (mermaid syndrome) and anencephaly are severe congenital malformations with high mortality rates.
  • Monozygotic twins are genetically identical, making their discordant development in such severe congenital anomalies a subject of interest.
  • Understanding the etiology of complex congenital anomalies is crucial for genetic counseling and prenatal diagnosis.

Observation:

  • A monozygotic twin pregnancy resulted in one fetus with a combination of sirenomelia and anencephaly.
  • The affected twin presented with additional anomalies including cleft palate, rachischisis, and vertebral segmentation defects in the cervical and upper thoracic spine.
  • The co-twin, a liveborn female, had a large cystic paraovarian teratoma and duplicated internal genitalia.

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Findings:

  • The co-occurrence of sirenomelia and anencephaly in a monozygotic twin is exceptionally rare, with only two prior documented cases.
  • The spectrum of anomalies in the affected twin suggests a profound disruption in early embryonic development, potentially affecting multiple organ systems.
  • The presence of a teratoma and genital duplication in the co-twin indicates distinct developmental pathways or secondary events within the same gestation.

Implications:

  • This case highlights the complex and potentially variable expressivity of genetic or environmental factors influencing twin development.
  • Further research into the molecular mechanisms underlying sirenomelia, anencephaly, and associated anomalies is warranted.
  • Such rare occurrences underscore the importance of detailed examination of both twins in cases of severe congenital malformations for a comprehensive understanding of developmental processes.