Breast Density and Mammography Reporting Act of 2017 This bill amends the Public Health Service Act to require mammography facilities to include up-to-date information about breast density in both the written report of the results of a mammography examination provided to a patient's physician and the summary of that written report given to the patient. The summary must convey: (1) the effect of breast density in masking the presence of breast cancer on a mammogram, and (2) that individuals with dense breasts should talk with their health care providers about any questions or concerns regarding the summary and whether they would benefit from additional tests. The bill requires the Department of Health and Human Services to expand and intensify research on breast density, the cost-effectiveness and feasibility of supplemental imaging relating to breast density, and best practices concerning mammograms and supplemental screening for those with dense breasts.