Locally advanced mammary analogue secretory carcinoma of the parotid gland

Mammary analogue secretory carcinoma (MASC) has recently been recognized as a salivary gland tumour that is characterized by the ETV6–NTRK3 fusion gene. A case of locally advanced MASC of the parotid gland in a 67-year-old man is presented here. The patient visited the hospital due to a large right infra-auricular mass, which had been enlarging gradually over a period of 2years. Contrast-enhanced computed tomography (CT) demonstrated a multilocular mass, 75×63mm in size, containing a fluid component with non-uniform contrast effects in the interior portion.

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