Figure 4c: (a) Gray-scale US image shows ductal carcinoma in situ (*) and cyst (
) visualized in their largest cross sections. (b) Contrast-enhanced power Doppler image shows spotty peripheral flow in the cancer and more complete filling (color blooming artifact) in the cyst. (c) Gray-scale SHI image shows both peripheral and intratumoral flow in the cancer (*), while the cyst () is essentially avascular.