Figure 1. Papillary intraductal carcinoma in a 55-year-old woman with a subtle nodule in the left breast clinically. (a) Radial view of ultrasound shows lobulated (arrow), mildly hypoechoic mass with intraductal extension (arrow head) and no acoustic shadowing. (b) Mammogram shows dense breast parenchyma without obvious abnormality.

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