Figure 3. Radiologic findings of a 73-year-old woman with a 1-week history of spontaneous bloody discharge from the right nipple. (A) Mediolateral mammography of right breast shows no definite abnormality to explain right bloody nipple discharge. Transverse (B) and longitudinal (C) ultrasound images of the right breast show a 1.0 cm sized isoechoic, irregularly shaped, spiculated mass with nonparallel orientation (Breast Imaging Reporting and Data System category 5) which was located at 8 o'clock 1 cm from nipple. Ultrasound-guided biopsy was performed, and the pathologic result was consistent with ductal carcinoma in situ. Subsequent surgery was performed.