extremely dense breast tissue

A term used to describe breast tissue that is made up of almost all dense fibrous tissue and glandular tissue.  On a mammogram, the dense areas of the breast make it harder to find tumors or other changes.  Women who have extremely dense breast tissue have a higher risk of breast cancer than those who have little or no dense breast tissue.  Extremely dense breast tissue is one of the four categories used to describe a level of breast density seen on a mammogram.  About 10% of women have this type of breast tissue.

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