CT scan showing two large gallstones that have a rim of calcification (large arrows). (From Schwartz DT, Reisdorff EJ. Emergency Radiology. New York: McGraw-Hill; 2000:538, Fig. 19-41A. Copyright 2000, McGraw-Hill.) Source: Chapter 62. Gallstones, The Color Atlas of Family Medicine, 2e Citation: Usatine RP, Smith MA, Chumley HS, Mayeaux EJ, Jr.. The Color Atlas of Family Medicine, 2e; 2013 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/Books/usat2/usat2_c062f005.png&sec=45364582&BookID=685&ChapterSecID=45361107&imagename= Accessed: November 13, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved