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MyoD1 expression in fibroepithelial stromal polyps.

Hum. Pathol.2020 May;99:75-79. Epub 2020 Mar 23
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摘要


Fibroepithelial stromal polyps (FESPs) are benign polypoid mesenchymal lesions thought to arise from desmin-positive specialized stromal cells of the female genital tract. Although most cases are easily diagnosed by morphology alone, the morphology of FESPs is variable and in some instances can contain hypercellular stroma with numerous atypical desmin-positive cells, simulating botryoid embryonal rhabdomyosarcoma (ERMS). Recently, we encountered a cellular FESP showing desmin expression as well as nuclear immunoreactivity for the skeletal muscle-associated transcription factor MyoD1. Although these lesions are widely known to express desmin, there are very few studies examining expression of the more specific markers of skeletal muscle differentiation, myogenin and MyoD1. The aim of our study was to examine desmin, MyoD1, and myogenin expression in a series of 25 FESPs. Of the 25 cases, desmin expression was present in 23 (92%), at least focal MyoD1 expression was present in 10 (40%), and all cases were negative for myogenin. Follow-up data were available for all 25 cases, and none recurred or behaved in a malignant fashion. Awareness of this potential immunohistochemical pitfall and careful morphologic evaluation should allow for the confident distinction of MyoD1-positive FESP from botyroid ERMS in almost all instances.

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