Fig. 3From: Background parenchymal uptake on molecular breast imaging as a breast cancer risk factor: a case-control studyMosaic plots show distribution of background parenchymal uptake (BPU) categories on molecular breast imaging (MBI) as a function of Breast Imaging-Reporting and Data System (BI-RADS) breast density categories for cases (a) and controls (b) interpreted by reader 1 and cases (c) and controls (d) interpreted by reader 2. BI-RADS 1 = almost entirely fat; BI-RADS 2 = scattered fibroglandular densities; BI-RADS 3 = heterogeneously dense; BI-RADS 4 = extremely denseBack to article page