Breast Adenomyoepithelioma

**Semantic type:** Neoplastic Process

**Definition:** A usually benign tumor arising from the breast. It is characterized by the proliferation of cells with myoepithelial differentiation around spaces which are lined by epithelial cells. Rarely, the epithelial and/or myoepithelial cells may undergo malignant transformation. Cases with malignant transformation may follow an aggressive clinical course, including recurrences and local and distant metastases.

**Synonyms:** - Adenomyoepithelioma - Adenomyoepithelioma of the Breast