This comprehensive textbook - based on the teaching courses of the famous Donald School courses - is a detailed introduction to transvaginal sonography ĂTVS¨. This important diagnostic technique is widely used in obstetric and gynecology clinics worldwide. The book includes an introductory section on the basics of TVS and then extensive sections on clinical applications in obstetrics, gynecology, and infertility. Unlike competing texts, there are also detailed sections on the modern techniques of Doppler sonography and three-dimension and four-dimensional TVS.