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Fig. 4A —54-year-old woman with invasive ductal carcinoma and benign node (type 1). Sonogram (A), histopathologic photograph (B), and diagram (C) show almost no cortex (arrows), which is more evident in B. Hilum (H) has paradoxically hypoechoic areas due to presence of relatively few vessels and mostly homogeneous fat cells and lacks many reflective interfaces. Relatively hyperechoic areas correlate with vessels and trabeculae.