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Breast density is determined by the radiologist who reads your mammogram. There are four categories of mammographic density. The radiologist assigns each mammogram to one of the categories. Your doctor should be able to tell you whether you have dense breasts based on where you fall on the density scale.
Breast density in the U.S.
10% of women have almost entirely fatty breasts
10% have extremely dense breasts
80% are calssified into one of two middle categories