Merkel Cell Carcinoma with a Desmoplastic Portion

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Merkel cell carcinoma of the skin usually has a trabecular, intermediate-cell or small-cell pattern of differentiation. We report the case of a 66-year-old man who developed a progressive multinodular plaque that showed a prominent desmoplastic component on preliminary biopsy. Immunohistochemical and ultrastructural studies and the final surgical specimen confirmed that the tumor was a Merkel cell carcinoma. The presence of desmoplasia may mask the diagnosis of Merkel cell carcinoma.

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