RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Bloom, Steven L. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Casey, Brian M. A1 Spong, Catherine Y. SR Print(0) ID 1160776122 T1 Breech Delivery T2 Williams Obstetrics, 25e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259644320 LK accessmedicine.mhmedical.com/content.aspx?aid=1160776122 RD 2024/04/19 AB The essential prerequisite for the successful performance of breech extraction lies in the complete dilatation of the cervix and the absence of any serious mechanical obstacle. It is true that in a certain number of cases extraction through an imperfectly dilated cervix is possible, but this is usually effected only at the cost of deep cervical tears.—J. Whitridge Williams (1903)