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Microcystic adnexal carcinoma with germinative follicular differentiation
Cristina Moya-Martínez1, Juan Torre-Castro1, Dolores Mendoza-Cembranos1
1Dermatology Department, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain.
Abstract:
Microcystic adnexal carcinoma (MAC) is a low-grade adnexal carcinoma with controversial lines of differentiation. We present here an example of MAC showing histopathologic findings of germinative follicular differentiation in the form of solid aggregates of trichoblastoma intermingled with neoplastic aggregates of MAC. Immunohistochemical findings, showing positivity for PHLDA1 and negativity for BerEp4 in neoplastic aggregates of trichoblastoma, also supported a germinative follicular differentiation. Follicular differentiation in MAC supports an apocrine line of differentiation for this neoplasm.
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