Figure 3

ALK expression-negative epithelioid fibrous histiocytomas. One tumor arose on the shin and contained numerous lipidized cells, as well as epithelioid cells with binucleation; this tumor may represent an unusual lipidized fibrous histiocytoma with epithelioid features (a, b). Another case showed a somewhat more solidly cellular growth pattern without the prominent vessels usually seen in epithelioid fibrous histiocytoma (c); however, the cytomorphology of the tumor cells was indistinguishable from other cases of epithelioid fibrous histiocytoma, and frequent binucleate forms were present (d).