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- Benign proliferation of duct epithelial and myoepithelial cells
- 70% lesions central, involves main ducts in subareolar region
- 30% occurs in peripheral breast, in terminal duct lobular units
- Lesion is occult usually in mammography
- Ultrasound and galactography are high yielding
- Use generous gel, roll nipple to the side, and use an angled view to evade the sub- nipple shadowing
- Ultrasound shows dilated ducts, with echogenic content, especially if there is discharge/bleeding
- MRI T2 weighted sequences can show intraductal soft tissue appearing iso to hypointense in the background of a hyperintense duct
- Contrast studies are often equivocal and excision is the standard treatment
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