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  • Title: Microcystic adnexal carcinoma with sebaceous differentiation: Three cases.
    Author: Fernandez-Flores A, Llamas-Velasco M, Saus C, Patel A, Rutten A.
    Journal: J Cutan Pathol; 2018 Apr; 45(4):290-295. PubMed ID: 29352496.
    Abstract:
    Microcystic adnexal carcinoma (MAC) is a low-grade malignant tumor of the skin. Histologically, this tumor shows a biphasic pattern, with cords and nests of basaloid cells, as well as keratin horn cysts. This biphasic histological appearance has been interpreted by some authors as a sign of double eccrine and folliculosebaceous-apocrine differentiation, whereas some other authors defend a solely eccrine differentiation. In this context, sebaceous differentiation in MAC would support the first option. However, there are only 3 cases of MAC with sebaceous differentiation in the literature, and all of them were reported before adipophilin was available, which in the appropriate context (eg, testing clear cells for sebaceous vs eccrine differentiation) is very useful. In this study, we present 3 cases of MAC with focal sebaceous differentiation confirmed by immunoexpression of adipophilin in the sebaceous foci.
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