Fig. 4

A patient presented with serous discharge from the left breast for two days. A Breast ultrasound revealed a hypoechoic nodule at the 3 o’clock position of the left breast. The relationship between this nodule and the duct was unclear. B USG revealed twisted ductal structures with lesions infiltrating outward along the ducts. C CEUS showed the nodule exhibiting heterogeneous hyper-enhancement and an enlarged enhancement scope (arrow). D Pathology identified the lesion as an invasive ductal carcinoma