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Figure 4: Histopathologic evaluation of the right upper and middle bilobectomy specimen of the patient showing the following results. (a) Immunohistochemical staining, ×100 - Showing vimentin positivity by tumor giant cells. (b) Immunohistochemical staining, ×100 - Showing keratin positivity by tumor giant cells. (c) H and E, ×100 - Showing the phenomenon of "emperipolesis", where in large pleomorphic cells are seen to engulf the neutrophils'. (d) H and E, ×40 - Showing the biphasic pattern of giant cell carcinoma of the lung

Figure 4: Histopathologic evaluation of the right upper and middle bilobectomy specimen of the patient showing the following results. (a) Immunohistochemical staining, ×100 - Showing vimentin positivity by tumor giant cells. (b) Immunohistochemical staining, ×100 - Showing keratin positivity by tumor giant cells. (c) H and E, ×100 - Showing the phenomenon of