Gynecologic ultrasound a problem-based approach / Beryl R. Benacerraf, MD, Clinical Professor of Radiology and Obstetrics and Gynecology and Reproductive Biology, Harvard Medical School, Radiologist, Brigham and Women's Hospital, Consultant in OB-GYN, Brigham and Women's Hospital and Massachusetts General Hospital, Boston, Massachusetts, Steven R. Goldstein, MD, Professor of Obstetrics and Gynecology, New York University School of Medicine, Director, Gynecologic Ultrasound , Co-Director, Bone Densitometry, New York University Langone Medical Center, New York, New York, Yvette S. Groszmann, MD, MPH, Clinical Instructor in Obstetrics, Gynecology and Reproductive Biology, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts.