Cutaneous Malignant Mixed Tumor Report of a Case and Review of the Literature

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Abstract
We describe an unusual malignant cutaneous neoplasm having a biphasic growth pattern and apparently arising in a mixed tumor. A lymph node metastasis was similar histologically to the primary lesion, exhibiting both carcinomatous differentiation and areas that appeared sarco-matous. Immunohistochemical stains showed selective staining for high molecular weight keratin in carcinomatous areas and for vimentin in areas having a sarco-matous appearance. The literature of cutaneous malignant mixed tumor is reviewed and possible explanations for the unusual morphology and immunohistochemical staining pattern are discussed.

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