Fig 2. Invasive ductal carcinoma in the left breast of a 55-year-old patient with discordance in the human epidermal growth factor receptor 2 (HER2) status between core needle biopsy (HER2 positive) and the surgical specimen (HER2 negative) after neoadjuvant chemotherapy.

A. Mammography does not show any visible mass in the left breast. B. Ultrasonogram shows an 8-mm microlobulated, hypoechoic mass in the left breast.