Fig. 2

A A macroscopic image of the cut lung surface. A white mass with pleural indentation was observed on the cut surface of the lung. B A loupe image of the mass. A nodule of carcinoid (green line) was observed close to the adenocarcinoma (red line). C A middle-power view of the boundary area of carcinoid (arrowhead) and adenocarcinoma (red line). The two components were distinct. Mild inflammation and fibrosis were observed between the two components. D, E High-power views of the carcinoid (d) and adenocarcinoma (e). [c–e: bar = 200 μm]