How to find out "mammographic density" and dense breast tissue
- Detailed cancer.org guide to breast cancer detection, including dense breast tissue” discussion.
Hints from a radiologist.
You can ask for a copy of the radiologist’s report from your last mammograms.
Sometimes the report will say whether or not the mammograms show dense breast tissue. If the report says they are "very" dense, then they are probably in 75% to 100% density category. If the report says they are "somewhat" or "moderately" dense, then they are probably in the 50% to 74% category. If the report says the breasts are " entirely fatty", they are probably in the 0% category. If the report says they are "mostly" or "somewhat" or "partially" fatty, they are probably in the 1% to 24% category. Note: Some radiologists are not required to describe the mammographic density in their reports. Many radiologists do not mention anything about mammographic density, unless the density is great enough to interfere with their ability to interpret the mammograms.
What if the mammograms were taken as part of an organized screening program?
In this case, there may not be a written radiologists report, but some screening result data must be recorded somewhere. You can ask the screening program administrators if mammographic density is recorded in their databases. Many (but not all) screening programs do this, and they may be able to tell you your mammographic density.
You can ask the radiologist
who reported the mammograms, to estimate your mammographic density percentage. You can just ask “Do I have dense breast tissue?” Some radiologists would happily do this for you. Others might be too busy or hard to reach.
You can ask to see your mammo films,
and judge for yourself. Some mammography centers will loan you your mammograms. Others may offer to charge you a fee to make copies of the films. Without taking your mammograms away from the mammography center, should at least be able to look at them for free. When you look at your mammograms you can judge the density for yourself.
See these examples of what mammograms look like
|1% to 24% density|
|25% to 49% density|
|50% to 74% density|
|75% to 100% density|
A woman’s risk of breast cancer increases if her breasts are mammographically dense. You can test this using the breast cancer risk calculator..
My other website Breast-cancer.ca is where most of my breast cancer information has been accumulating.
- Vachon CM, van Gils CH, et al. Mammographic density, breast cancer risk and risk prediction. Breast Cancer Res. 2007 9:217.
- Assi V, Massat NJ, et al. A case-control study to assess the impact of mammographic density on breast cancer risk in women aged 40-49 at intermediate familial risk. Int J Cancer 2014: