Figure 4: False negative case images in a 68-year-old woman with ductal carcinoma in situ.

(a) The lesion (arrows) is shown on B-mode ultrasound. (b) The lesion (arrows) shows regularly parallel contour lines on the shear wave propagation mode. (c) The Emean, ESD and Eratio of the lesion (arrows) on elasticity mode are 6.9 kPa, 2.1 kPa and 1.38 respectively. (d) The Emean, ESD and Eratio of the lesion (arrows) on shear wave speed mode are 1.52 m/s, 0.22 m/s and 1.17 respectively.