Fig. 1From: Coexistence of carcinoid tumor and adenocarcinoma of the lung; morphological, immunohistochemical and genetic analyses, a case reportA Loupe images of two sections contain a solid lesion (atypical carcinoid: green line) and a cystic lesion (papillary adenocarcinoma: red line), which coexisted in proximity. The atypical carcinoid infiltrated into the papillary adenocarcinoma. B The atypical carcinoid, having finely granular nuclear chromatin, proliferated with an organoid pattern. C The wall of the cystic lesion was papillary adenocarcinoma. D, E The atypical carcinoid spread through veins and lymphatic vessels, and nests of carcinoid tumor (arrowhead) were observed in the adenocarcinoma component. There was a clear demarcation between the two tumor parts, without any histological transitions or intermingling between the two types of tumor cells. [b–e: bar = 100 μm]Back to article page