Fig. 1

a 45-year-old female patient showing changes of posterior acoustic shadowing of a mammary nodule of fibrocystic mastopathy over time. In the first year, breast nodule image showing a weak posterior acoustic shadowing, oval shape, parallel position, and circumscribed margin (a). Over time, the nodule showed a non-parallel position (taller than wide or vertical), and the posterior acoustic shadowing was obvious (b). Subsequently, the posterior echo was significantly attenuated, and the posterior field was unclear (c). In E imaging of nodules, the elasticity of nodules was similar to that of the surrounding tissues. The elastic modulus value of the nodule was measured by E imaging, and Emax was 36 kPa (d). Powdery object was extractioned by hollow needle puncture (arrow) (e). The pathology results confirmed that the lesion indicated fibrocystic mastopathy (HE, 40 ×) (f)