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    Using ultrasound to recognize fetal anomalies: Part 1

    First- and second-trimester ultrasounds are key prenatal tools for revealing structural anomalies that may point to genetic conditions.

     

    Another diagnosis that can be suspected based on second-trimester ultrasound is agenesis of the corpus callosum (Figure 16), a condition in which the large midline bundle of white matter connecting neurons in the 2 hemispheres is absent. Agenesis of the corpus callosum should be suspected when the cavum septum pellucidum is not visible, the third ventricle appears prominent, and the lateral ventricles have a teardrop-shaped configuration, with dilation of the posterior horns.

    NEXT: More second trimester fetal abnormalities

    Stephen T Chasen, MD
    Dr Chasen is Professor of Clinical Obstetrics and Gynecology in the Department of Obstetrics and Gynecology at Weill-Cornell Medical ...
    Daniel W Skupski, MD
    Dr Skupski is Professor of Clinical Obstetrics and Gynecology in the Department of Obstetrics and Gynecology at Weill-Cornell Medical ...

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