Abstract
Sonographic evaluation in the first trimester of pregnancy almost always is performed using the transvaginal approach. The increased resolution afforded by this technique has made it possible to detect early embryologic events that can cause problems in interpretation by the general radiologist. To comprehend abnormal ultrasound findings in early pregnancy and avoid potential pitfalls of misdiagnosis, it is important to understand normal physiologic and anatomic changes during embryologic and fetal development.1 These potential pitfalls can be classified into five categories: anembryonic gestation, ectopic pregnancy, physiologic umbilical herniation, nuchal translucency, and open rhombencephalon.
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