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Fig. 3 —33-year-old woman with infiltrating ductal cancer. Sonogram of benign lymph node shows hypoechoic cortex (C) with slightly hyperechoic paracortex (P) can be correlated to outer zone of lymphoid tissue in Figure 1. Hilum (H) is hyperechoic, representing central sinus, medullary cords, blood vessels, and fat. Afferent and efferent vessels cannot be seen with sonography.