On this mammogram image, dark areas are fatty tissue, light areas are denser tissue which contain ducts, lobes, and other findings. Lighter areas of a mammogram reveal breast tissue that may be glandular (part of the milk system) or breast masses.
Normal Dense Breast Tissue on a Mammogram
National Cancer Institute
Shown are 2 mammograms
of normal dense breasts. A dense breast makes a mammographic image difficult to read when -- and if -- cancerous lesions are present. These images are typical of younger women's breasts.
Premenopausal women, especially women who have never been pregnant, may have dense breast tissue. These are normal dense breasts. Because fatty breasts are easier for a mammogram to see through, dense breast tissue can sometimes hide outlines of areas that need closer study. If a particular area needs a better image, an ultrasound
is usually the next step.
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Dr. Dwight Kaufman. Diagnosis: Mammogram: Normal Dense National Cancer Institute. February 1994.