Acinic cell carcinoma of the breast arising in microglandular adenosis.

Acinic cell carcinoma is a rare breast tumour belonging to salivary gland-like tumours of the breast. They are "triple-negative" breast cancers even if their biological behaviour seems to be more favourable. Herein we present an acinic cell carcinoma arising on a background of typical and atypical microglandular adenosis in a 58-year-old woman, along with a review of the literature.