Transvaginal ultrasonography.

Transvaginal ultrasonography has provided new anatomic and pathophysiologic information about the female pelvis. Because of probe proximity to the organ of interest and higher insonating frequency, resolution is dramatically improved. Problems previously encountered during transabdominal scanning, such as obesity, bowel gas, and a retroverted uterus, no longer preclude accurate diagnosis. Patient acceptance is nearly universal. Physiologic information concerning the endometrium and ovarian follicles has improved infertility diagnosis and treatment. Hormonal and vascular Doppler changes can be correlated with cyclic endometrial patterns and follicle size. Oocyte retrieval, management of pre-existing inflammatory disease, and treatment of complications of pregnancy are easier and safer with a transvaginal approach. Uterine malformations, leiomyomas, and cancers are more easily detected in premenopausal and postmenopausal women. The documentation of early intrauterine or ectopic pregnancy has decreased maternal morbidity and mortality. Tube-sparing procedures with preservation of reproductive potential are now more commonly employed due to earlier recognition of unruptured tubal pregnancy. Interventional TVS has led to improved recognition and treatment of pelvic cysts and abscesses and multiple pregnancy. Chorionic villous sampling can be performed more easily without the need for anesthesia, with adequate tissue obtained.