These example mammograms are not very dense.
In these examples, look at each mammogram individually. Within each image there are light and dark areas. The lighter whiter areas contain "fibroglandular" tissue, which is a mixture of "glands", "milk ducts" and the "fibers" that support the breast. Some women have more fibroglandular tissue than others. In these example above, the whiter areas occupy less than 1/4 of the overall breast, and at least 3/4 of the mammograms show the darker tissue, which is adipose tissue or fat. It natural for breasts to be mostly made of adipose tissue. So, these are examples of 1% – 24% mammographic density. Compare these to the other examples in the index.
or try the other Health Calculators on the main index, including your ideal weight.
I also have a whole separate website on breast cancer topics, particularly pertaining to different types of breast diseases.
I should mention, I made this webpage a long long time ago, in year 2000 I believe. I updated it in 2014, but the pictures are old, from the days of film and chemistry. Nowadays, mammograms are digital, so I realize my images are suboptimal by modern standards. Then again, this webpage doesn’t get much traffic, but if I do notice that people are wanting better examples, I can find more, because I do mammography every day.