Figure 1

Example of invasive ductal carcinoma after silicone injection in the breast. A 73-year-old woman who received silicone injection had a suspicious lesion in the left breast on magnetic resonance imaging (MRI) screening. (A) Axial and sagittal contrast enhanced T1-weighted image showing clustered, lobular, rim-enhancing masses with relatively smooth margins in the left breast, which were categorized into American College of Radiology Breast Imaging Reporting and Data System category 4b. (B) Axial T1-weighted subtracted dynamic image acquired immediately before biopsy showing clustered enhancing masses. (C) Axial T1-weighted subtracted dynamic image of the left breast showing the presence of the obturator (arrow) within the mass. (D) Axial T1-weighted subtracted dynamic image of the left breast immediately after 9-gauge MRI-guided vacuum-assisted biopsy showing air and hematoma at the biopsy site. Histologic analysis demonstrated invasive ductal carcinoma.