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Dense breast tissue: What it means to have dense breasts

How does dense breast tissue affect breast cancer screening?

Dense breast tissue makes it more difficult to interpret a mammogram, since cancer and dense breast tissue both appear white on a mammogram. Very dense breasts may increase the risk that cancer won't be detected on a mammogram.

Women with very dense breasts who develop breast cancer are more likely than those with very fatty breasts to have their cancer discovered after a recent normal mammogram.