Fig. 3

Macroscopic and histopathological findings of the tumor. a The tumor is white in color and the size of the tumor is 1.1 cm in diameter. b The tumor cells with enlarged nuclei form an irregular small gland with inflammatory stroma, suggesting adenocarcinoma. c The tumor cells with oval vesicular nuclei grow in cord-like or anastomosing branching patterns. d Tumor periphery shows dense inflammatory cells with ductular reaction. The cells and their nuclei of reactive ductules are smaller than those of adenocarcinoma. (b–d Original magnification × 200)