[Adenoid cystic carcinoma of the breast. Case report]

We report a case of adenoid cystic carcinoma of the breast in a 62-year-old lady. This tumor is a rare histologic form of breast cancer, associated with a favorable prognosis, and a special clinical behavior. It is mainly diagnosed on morphological grounds, by identifying two populations of neoplastic basaloid myoepithelial and epithelial cells with extracellular deposits of eosinophilic basement membrane-like substance. Lymph node metastases are rare. Partial or simple mastectomy is an adequate treatment. Axillary lymph node dissection may not be necessary.