Figure 1From: Mammographic density. Measurement of mammographic densityA six-category system for classifying mammographic density. The categories describe the fraction of fibroglandular tissue in the breast as judged by an observer and are: (a) 0, (b) <10%, (c) 10–25%, (d) 26–50%, (e) 51–75%, (f) >75%. Reproduced from [1] with permission from American Association for Cancer Research.Back to article page