Pelvic ? oor ultrasound is often described as a niche investigation within obstetrics and gynecology and even within gynecological ultrasound. After reading this book, I am convinced that it should be a mainstream investi- tion taught to all fellows and subspecialty trainees. Nothing should be of more importance to obstetricians and gynecologists than the protection of the pelvic ? oor of their patients and effective treatment when disorders arise. These disorders cause more prolonged and disruptive misery to patients than many of the conditions that clog up the waiting list in obst- rical and gynecological departments. This book is more than an ¿atlas¿; it is an education in the anatomy and dynamics of the lower urinary tract and pelvic ? oor and the investigation of disorders that occur, such as incontinence and prolapse. Ultrasound, despite its preeminence as an investigative tool in obstetrics and gyne- logy, has been slow to achieve such status in urogynecology, principally because the transvaginal ultrasound probe which is the standard tool in gynecologic scanning distorts the pelvic ? oor anatomy. This makes int- pretation of prolapse impossible. It was the realization that perineal or translabial ultrasound provided equally good and artefact-free information on bladder dynamics and the integrity of the pelvic ? oor that a change in attitude occurred.