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Figure 1b: Images in 49-year-old woman with dense breast parenchyma. (a) In mediolateral oblique screening mammographic view, no lesion is visible. (b) In craniocaudal screening mammographic view, a circumscribed lesion (arrows) is visible, with more than 25% of circumference obscured by dense breast tissue. (c) On US scan, 9-mm well-circumscribed mass (arrows) of low echogenicity was found in upper inner quadrant and was classified as probably benign (BI-RADS category 3). Mass remained stable at follow-up for more than 3 years.