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A. Ultrasonography shows an oval, circumscribed hyperechoic mass with a central hypoechoic area and posterior acoustic enhancement. B. Color Doppler ultrasonography shows internal vascularity. Ultrasound-guided core needle biopsy revealed a lactating adenoma. C. On a follow-up ultrasonography 8 months after cessation of lactation, the lactating adenoma had decreased in both size and internal echogenicity.
