Figure 3

Lung tissue stained with H&E and immunohistochemistry. (a) lung tissue stained with H&E, Alveolar was infiltrated with eosinophils (× 400 magnification). (b) There are CEA positive cells in lung tissue (× 400 magnification). (c and d) Immunostaining for CEA showed that CEA was observed in the cells which were characteristic of eosinophils (× 800 magnification).