Giess CS, et al. - Here, researchers review the ultrasound (US) features of developing asymmetries and correlate them with histopathologic findings. When present, US correlates for developing asymmetries are often nonmass findings with mixed echotexture. Most malignant developing asymmetries with the US correlates present as a hypoechoic mass. However, 19% present as a nonmass finding with either mixed hyperechoic and hypoechoic echotexture or hypoechoic echotexture.