The Fetal Heart and Great Vessels
The Fetal Heart and Great Vessels INTRODUCTION Fetal cardiac examination in the first trimester focuses in general on the evaluation of body situs, the four chambers, and the great vessels…
The Fetal Face and Neck
The Fetal Face and Neck INTRODUCTION Visualization of the fetal face and neck in early gestation is an important aspect of the ultrasound examination as it has been incorporated in…
Placenta and Umbilical Cord
Placenta and Umbilical Cord INTRODUCTION The placenta is a highly specialized organ that supports growth and development of the fetus and serves as the interface between the maternal and fetal…
The Fetal Urogenital System
The Fetal Urogenital System INTRODUCTION The first trimester examination of the fetal urogenital system primarily focuses on the demonstration of a fluid-filled bladder. When technically feasible or in specific high-risk…
The Fetal Chest
The Fetal Chest INTRODUCTION The examination of the fetal chest in the first trimester includes the assessment of the right and left lung, the bony and cartilaginous thoracic cage, the…
First Trimester Screening for Chromosomal Aneuploidies
First Trimester Screening for Chromosomal Aneuploidies INTRODUCTION The incidence of fetal numerical chromosomal aneuploidies such as trisomy 21 (T21; Down syndrome), trisomy 18 (T18; Edwards syndrome), and trisomy 13 (T13;…
The Detailed First Trimester Ultrasound Examination
The Detailed First Trimester Ultrasound Examination INTRODUCTION The role of the ultrasound examination in the first trimester has changed over the last 30 years with the introduction of nuchal translucency…
Technical Aspects of the First Trimester Ultrasound Examination
Technical Aspects of the First Trimester Ultrasound Examination INTRODUCTION Over the past two decades the detailed ultrasound examination of a fetus before the 16th week of gestation was made possible…
Multiple Pregnancies in the First Trimester
Multiple Pregnancies in the First Trimester INTRODUCTION The widespread use of assisted reproductive technologies along with increasing maternal age has resulted in a steady rise in the frequency of multiple…
Fetal Biometry and Pregnancy Dating in the First Trimester
Fetal Biometry and Pregnancy Dating in the First Trimester INTRODUCTION Accurate performance of an ultrasound examination in the first trimester is important given its ability to confirm an intrauterine gestation,…
