Mammary analogue secretory carcinoma (MASC): A literature review and report of two cases
Journal: Journal of Clinical Images and Medical Case Reports (Vol.2, No. 6)Publication Date: 2021-12-31
Authors : Yi Hai Li; Naveed Basheeth; Aneesh Kumar;
Page : 1-5
Keywords : head and neck neoplasms; salivary gland; parotid gland; salivary gland neoplasms; parotid neoplasms; immunohistochemistry; mammary analogue secretory carcinoma.;
Abstract
Introduction: Mammary analogue secretory carcinoma (MASC) is a rare salivary gland tumour. It is generally a low-grade lesion that presents as a slow growing painless swelling with an indolent course with good survival. Diagnosis is typically via the highly specific ETV6- NTKR3 gene fusion with the translocation t(12;15)(q13;q25). Method: A literature review was conducted through PubMed, Cochrane, and Medline. We also present two cases. Results: Although typically regarded as a low-grade lesion, highgrade features, such as nodal metastases, more solid and trabecular architecture with necrosis, and the ETV6-X fusion gene, have been described. Our cases were diagnosed through morphologic and immunohistochemical features despite absence of the classic fusion gene. Conclusion: MASC can be diagnosed in absence of the highly specific ETV6-NTKR3 in presence of certain morphologic and immunohistochemical features. Although it is a typically low-grade lesion, several high-grade features have been described that may require further treatment.
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