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Related Experiment Videos

Transverse cerebellar diameter in twin gestations.

T Shimizu1, S Gaudette, C Nimrod

  • 1Department of Obstetrics and Gynecology, University of Ottawa, Ottawa General Hospital, Ontario, Canada.

American Journal of Obstetrics and Gynecology
|October 1, 1992
PubMed
Summary

Transverse cerebellar diameter measurements are reliable for estimating gestational age in twins, unaffected by growth discordancy. This ultrasonographic marker shows similar accuracy in twins as in singletons.

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Area of Science:

  • Maternal-Fetal Medicine
  • Prenatal Diagnostics
  • Fetal Biometry

Background:

  • Accurate gestational age estimation is crucial for optimal perinatal management.
  • Twin pregnancies present unique challenges for fetal growth assessment due to potential discordancy.

Purpose of the Study:

  • To assess the utility of transverse cerebellar diameter (TCD) measurements for estimating gestational age in twin pregnancies.
  • To determine if TCD is influenced by chorionicity or growth discordancy in twins.

Main Methods:

  • A prospective, cross-sectional ultrasonographic study included 329 singleton fetuses and 47 normal twin pairs.
  • Standard fetal biometric parameters, including TCD, were measured.
  • TCD measurements were compared between singletons and twins, and within twin pairs (concordant vs. discordant).

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Main Results:

  • No significant differences in TCD were observed between normal singleton and twin gestations.
  • TCD measurements were consistent within twin pairs, irrespective of chorionicity or growth discordancy.
  • Singleton TCD nomograms provided satisfactory gestational age prediction for twins.

Conclusions:

  • Transverse cerebellar diameter is a reliable parameter for estimating gestational age in twin pregnancies.
  • TCD appears to be independent of discordant growth, making it a valuable tool in twin assessment.