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Fig. 2 | Breast Cancer Research

Fig. 2

From: High mammographic breast density predicts locoregional recurrence after modified radical mastectomy for invasive breast cancer: a case-control study

Fig. 2

Mammographic breast density measurement using the computer-assisted method. a Left mediolateral oblique projection mammograms were used to assess women with right-sided breast cancer. b A threshold was selected by the operator to isolate the breast from the surrounding background. c A second threshold was set to identify areas of density. d The mammographic breast density (MBD) percentage was determined by measuring the total area of the breast and the number of pixels outlined in the dense regions using the computer software. e The estimated MBD was classified according to the American College of Radiology (ACR) lexicon definition before 2013. Specifically, ACR 1 indicates <25% density and that “the breast is almost entirely fat.” ACR 2 indicates 25–50% density and that “there are scattered fibroglandular tissues.” ACR 3 indicates 50–75% density and that “the breast is heterogeneously dense.” ACR 4 indicates >75% density and that “the breast is extremely dense”

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