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CASE REPORTS
JOURNAL ARTICLE
TWIN STUDY
Craniorachischisis and heterotaxia with heart disease in twins: link or change nature?
Congenital Heart Disease 2010 September
Craniorachischisis is a rare neural tube defect in which both acrania and a complete schisis of the vertebral column are present. Heterotaxy results from failure to establish normal left-right asymmetry during embryonic development and is characterized by a variable group of congenital anomalies that include complex cardiac malformations and situs inversus or situs ambiguous. We report a diamniotic twin pregnancy with two malformed fetuses affected one by craniorachischisis and the other by heterotaxya with paired right-sided viscera, asplenia, and complex congenital heart disease. The occurrence of severe congenital anomalies in both members of the twin pair implies a strong influence of genetic factors. At present, the genetic basis determining the different phenotypes observed in our twins is unknown. Our case with the simultaneous presence of both midline and laterality defects in twins supports the hypothesis that the midline plays a critical role in establishing left-right asymmetry in the body and that a mutation in a gene responsible for both heterotaxy and midline defects may be strongly supposed.
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