Breast Density and Breast Cancer Risk: A Practical Review Amy T. Wang, MD, Celine M. Vachon, PhD, Kathleen R. Brandt, MD, Karthik Ghosh, MD  Mayo Clinic Proceedings  Volume 89, Issue 4, Pages 548-557 (April 2014) DOI: 10.1016/j.mayocp.2013.12.014 Copyright © 2014 Mayo Foundation for Medical Education and Research Terms and Conditions

Figure 1 Mediolateral oblique mammographic views depicting the 4 BI-RADS density categories: (A) almost entirely fat (BI-RADS 1 density); (B) scattered fibroglandular densities (BI-RADS 2 density); (C) heterogeneously dense (BI-RADS 3 density); (D) extremely dense (BI-RADS 4 density). BI-RADS = Breast Imaging Reporting and Data System. Mayo Clinic Proceedings 2014 89, 548-557DOI: (10.1016/j.mayocp.2013.12.014) Copyright © 2014 Mayo Foundation for Medical Education and Research Terms and Conditions

Figure 2 Craniocaudal mammographic views of a breast cancer in a BI-RADS 4 density breast (A) and a breast cancer in a BI-RADS 1 density breast (B). Mayo Clinic Proceedings 2014 89, 548-557DOI: (10.1016/j.mayocp.2013.12.014) Copyright © 2014 Mayo Foundation for Medical Education and Research Terms and Conditions

Figure 3 Approach to a woman with dense breasts (clinical algorithm). Mayo Clinic Proceedings 2014 89, 548-557DOI: (10.1016/j.mayocp.2013.12.014) Copyright © 2014 Mayo Foundation for Medical Education and Research Terms and Conditions