Measurement of Echogenic Area in the Border of the Fetal Ventricles

Sonographic coronal section in the lateral fetal ventricles shows echogenic area in the ventricles borders creating an "halo" around the ventricles. Histologically this area correlates to the Stratified transitional field. In this study we would like to measure this area for the purpose of creating a nomogram.

Inclusion Criteria:

• pregnant women 22-37 GA
• well dated pregnancy
• singleton pregnancy

Exclusion Criteria:

• no first trimester dating
• multifetal pregnancy
• known CNS abnormalities in the fetus
• small for gestational age