There are now 36 states and recent federal legislation that require that clinicians inform women about breast density results from mammography. Consequently, clinicians must be aware of the clinical ramifications of dense breasts and what to do about them when found. Karla Kerlikowske, MD, from UCSF explains the risks associated with dense breasts and how to manage patients who have them. CME will be available on July 2 when the print/online issue of JAMA is published.