Which BI-RADS density category is most likely to mask lesions on mammography?

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The key idea is that breast density affects how well lesions stand out on a mammogram. Dense tissue absorbs X-rays more like a lesion does, so both appear white on the image and can blur or obscure abnormalities. The denser the breast, the harder it is to distinguish a tumor from the surrounding tissue.

Among the density levels, extremely dense breasts have the largest amount of fibroglandular tissue relative to fat, so they create the most masking. Fatty tissue shows up dark on the film, making any white-appearing masses easier to spot, while the other density categories—scattered fibroglandular density and heterogeneously dense—still present increased masking compared with fatty breasts, but not to the extent of extremely dense ones. This greater masking risk in extremely dense breasts is why lesions can be more challenging to detect in those patients.