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Hematoxylin and eosin staining of needle biopsy of enlarging right upper lobe tumor shows epithelial elements (arrow) juxtaposed with sarcomatous stroma [S] (A); epithelial elements (arrows) are stained positive for pancytokeratin (MNF116) (B) and TTF-1 (C) but negative for vimentin (D) (immunohistochemical staining). The sarcomatous stroma [S] is only immunoreactive for vimentin (D). Magnification: (A) ×10; (B-D) ×20.
