Copyright © 2012 ISUOG. Published by John Wiley & Sons, Ltd. 1 The fetal head-symphysis distance: a simple and reliable ultrasound index of fetal station in labor Aly Youssef, MD*, Elisa Maroni, MD*, Antonio Ragusa, MD†, Francesca De Musso MD*, Ginevra Salsi, MD*, Maria Teresa Iammarino††, Alexandro Paccapelo††,Nicola Rizzo, Professor*, Gianluigi Pilu*, Professor, Tullio Ghi, MD, PhD* *Department of Obstetrics and Gynecology, Sant’Orsola MalpighiUniversityHospital, University of Bologna, Bologna, Italy †Department of Obstetrics and Gynecology, NiguardaHospital, Milan, Italy ††Department of Clinical Medicine, Alma Mater Studiorum - University of Bologna, Italy Corresponding author: Dr. Aly Youssef Department of Obstetrics and Gynecology, Sant’Orsola-Malpighi University Hospital University of Bologna Italy Via Massarenti 13 40138 Bologna Tel + 39 051 636 4369 e-mail: aly.youssef78@gmail.com Short title: head-symphysis distance Key words: fetal head-symphysis distance, ultrasound, intrapartum, labor, three-dimensional, translabial This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/uog.12335. Accepted Article