Fig. 2

Macroscopic and microscopic findings of the pulmonary nodule. a Cut surface of the surgical specimen. A white, well-circumscribed tumor with lobulated appearance is found along the bronchial wall. Microscopic findings (hematoxylin and eosin) reveals b a submucosal tumor oppressed by the adjacent bronchioles and c a part of the tumor is necrotic (original magnification; b ×20; c ×40). d Two different components are observed: e the duct-forming component and f outer multilayered polygonal cells with clear cytoplasm (original magnification; d ×200; e, f ×400)