Malignant Adenomyoepithelioma of the Breast

Adenomyoepithelioma of the breast is an uncommon tumor characterized by the presence of both epithelial and myoepithelial cells. We present a case of an 87-year-old woman with a left breast lump. No family history of breast cancer was retrieved. Core needle biopsy showed malignant proliferation of the epithelial cells, which is characterized by lack of expression of estrogen receptor (ER) and progesterone receptor (PgR), and the absence of HER–2 protein overexpression. The patient elected to undergo breast conserving treatment along with axillary sentinel node dissection. Definite diagnosis of adenomyoepitheliom…