A US-detected cancer in a 49-year-old woman that was initially assessed as BI-RADS category 4A (case 2 in Table 3). US shows an illdefined oval hypoechoic mass in right breast and it was assessed as category 4A. The pathologic diagnosis was invasive ductal cancer with ductal carcinoma in situ. US, ultrasound; BI-RADS, Breast Imaging Reporting and Data System.