PMC3355653_01
Malignant mesenchymal neoplasm with atypical spindle and epithelioid cells; a large number of them present with abundant eosinophilic nucleoli. Haematoxylin-eosin stain. x400.
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F1
Analysis of the haematoxylin-eosin-stained sections revealed a malignant pleomorphic mesenchymal neoplasm, characterized mainly by proliferation of atypical spindle and few epithelioid cells, in a plexiform pattern, admixed with giant multinucleated cells with abundant eosinophilic nucleoli (fig. 1).
Positive nuclear and cytoplasmic stain for myogenin in neoplasmatic cells. x400.
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F2
Immunohistochemistry displayed strong and diffuse positive stains for smooth muscle actin, vimentin, and CD99, and focally positive nuclear and cytoplasmic stains for Myo D1 and myogenin (fig. 2).