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51-year-old woman with breast cancer; thyroid cancer was detected 12 months after mastectomy. (A) Preoperative breast sonography showed an irregular hypoechoic mass (arrow) at left subareolar area, proving infiltrating ductal carcinoma. Initial thyroid sonography was negative. (B) 12-month follow-up sonography showed an approximately 5mm-sized taller-than-wider hypoechoic nodule at the right thyroid gland, proving papillary carcinoma.
