Fig. 2From: When chronic obstructive pulmonary disease meets small cell lung cancer: an unusual case report of rapid progressionA and B show the opening of the left upper lobe bronchus at the second and first hospitalization, respectively. A also shows the lesion on the bronchoscopic image (blue arrow). C shows Hematoxylin–eosin staining, D shows immunohistochemistry with Synaptophisin AntibodyBack to article page