Mammary Analogue Secretory Carcinoma
Mammary analogue secretory carcinoma (MASC) is a relatively recently described low-grade salivary gland neoplasm which is identical to its mammary counterpart at morphologic as well as molecular genetic levels. The majority of cases involve the parotid gland and a small proportion occur in the minor salivary glands. MASC usually consists of multiple lobules separated by fibrotic stroma. The lobules display a variety of architectural patterns, including solid, microcystic, macrocystic, papillary, tubular and cribriform.