This collection of 120 color slides with detailed captions illustrates the use of transvaginal color Doppler to identify and with pulsed Doppler indirectly quantify blood flow in vessels and organs as never before. The slides show how transvaginal color Doppler yields information about the position and character of small and tortuous normal or newly formed vessels in the uterus, in the ovary, and within tumor or embryological tissue. They also illustrate important clinical uses of transvaginal color Doppler in the early diagnosis of pelvic malignancy and in the evaluation of patients undergoing endoscopic surgery. They show how to identify the vitality and invasiveness of the ectopic trophoblast, how to select patients for appropriate management with minimal tubal damage, and the dynamic evaluation of tubal patency without exposure to contrast types or radiation.