How are breast density categories described?

• A. Density categories range from A (almost entirely fatty) to D (extremely dense)
• B. Density categories are A through D, with higher density meaning less transparency
• C. A to D categories range from almost entirely fatty to extremely dense
• D. Density categories are described as Low, Moderate, High, Very High

Answer: (A)

Breast density on mammograms is described using a simple four-category scale that runs from almost entirely fatty tissue to extremely dense tissue. This scale communicates how much fibroglandular tissue is present, which affects how the image appears and how easily anomalies can be seen. The clearest description is the one that explicitly states both ends: the low end is almost entirely fatty, the high end is extremely dense. This makes the categories easy to understand and apply in reporting. Other options either omit the endpoint meanings, use nonstandard terminology, or describe the scale in a less precise way, which is why the direct, end-to-end description is the best fit.