It means they can't get a clear view because of the denseness. This makes it harder to read the results.
Hi,
The meaning of dense breasts seen on a mammogram is that there is a greater proportion of whiteness to grayness in the breast.This whiteness makes mammograms reading more difficult to detect an abnormality and radiologists usually recommend more testing.The whiteness on the mammogram is a combination of glandular and fibrous supporting tissue.The gray on the other hand, is the fatty part of the breasts. As women age, their breasts on their mammograms get more gray (like their hair) because they don’t need the milk ducts anymore.
When a woman has dense breasts it's important to be vigilant and get additional testing if recommended.Get regular mammograms, do self breast examination, and see the doctors regularly.
Best wishes...