For decades, almost 40 years, Breast Density has been widely recognised as a clinical indicator and independent risk factor for breast cancer. For years, reputable medical journals, eminent radiologists, Breast Cancer Research Scientists, Patient Advocates, have all given us indisputable evidence of the associated risk factors between Breast density and Breast cancer, including late stage interval cancers and contralateral breast cancer.
1 month ago – Dàil Eireann – June 2017 – Minister for Health
“At present, Digital mammography platforms do not provide a quantifiable breast density measurement”
9 – years ago – Breast Cancer Research – June 2008 – BioMed Central
Breast Imaging Reporting and Data System density categories
“Currently, a widely used density classification scheme is the one associated with the Breast Imaging Reporting and Data System (BIRADS)  for reporting findings on mammography. This density system has four categories: BIRADS-1 indicates a predominantly fatty breast; BIRADS-2 scattered fibroglandular densities; BIRADS-3 a breast that is heterogeneously dense; and BIRADS-4, the highest level, an extremely dense breast that could obscure a lesion. This qualitative system was not developed to quantify risk, but to allow an interpreting radiologist to indicate the level of concern that a cancer in the breast might be missed on mammography due to masking by dense tissue. It is well known that the sensitivity of mammography is decreased in the dense breast [7, 8] and a high BIRADS score tells a referring physician who is concerned about breast cancer that other tests less affected by density, such as ultrasound or magnetic resonance imaging (MRI), might be warranted. More recently, in an attempt to make the BIRADS density system more quantitative, it has been recommended that mammograms be classified into four density categories with upper bounds of 24%, 49%, 74% and 100%.
You are not Dense but are your Breasts?