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Usual mammary analogue secretory carcinoma (MASC) morphologic features. (A) Gross photograph showing a lobulated and whitish-yellow colored tumor of the parotid gland. (B) MASC showing microcystic and papillary-cystic growth pattern. (C, D) Admixture of variable cell types with eosinophilic or vacuolated cytoplasm and intraluminal secretory material.
