A, B: Transvaginal images now demonstrate a rounded yolk sac within the gestational sac. Source: Chapter 7. Atraumatic Conditions of the Abdomen, The Atlas of Emergency Radiology Citation: Block J, Jordanov MI, Stack LB, Thurman R. The Atlas of Emergency Radiology; 2013 Available at: http://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/bloc1/bloc1_c007f081b.png&sec=42498365&BookID=573&ChapterSecID=42496369&imagename= Accessed: January 03, 2018 Copyright © 2018 McGraw-Hill Education. All rights reserved