What is the purpose of the posterior nipple line in describing lesion location?

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The Posterior Nipple Line provides a fixed reference point to describe where a finding sits within the breast. By drawing a line from the nipple toward the chest wall on a mammogram, radiologists can state the location of a lesion in relation to that nipple landmark—often describing how far it is from the nipple or whether it lies within that line. This standardizes localization across views and over time, making it easier to compare with prior images and to plan any necessary intervention. It isn’t about tissue density or describing the posterior aspect of the breast; rather, it’s about using the nipple as a reference axis to localize findings precisely.