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The visual classification associated with mammographic density [74]. Level 1—breast tissue consisting of entirely adipose tissue with almost no dense tissue. Level 2—scattered density with mostly fat tissue. Level 3—heterogeneous distribution of dense tissue with little fat in the breast tissue. Level 4—highly dense tissue with little to no adipose tissue [74].
(This figure is adapted from an article published by Mayo Clinic with their formal permission to be used in this manuscript)
