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Histopathological findings obtained from left upper lobectomy. An image of a hematoxylin and eosin-stained section showing the tumor diffuse proliferation of pleomorphic tumor cells. (A) (magnification, ×100) Immunohistochemical analysis showed positive for cytokeratin AE1/AE3 in the epithelial component (B) (magnification, ×100) and vimentin in the stromal component. (C) (magnification, ×100).
