This is a color-illustrated high-level reference text documenting the latest developments in obstetrical and gynecological ultrasound assessment and diagnosis during the first trimester of pregnancy. It is a technical work containing original, new data as well as literature reviews by prominent authorities. The book focuses on innovative, clinically effective uses of ultrasonography, including Doppler ultrasound, in assessing and diagnosing embryonic and fetal features and complications in the first trimester of pregnancy.