Fig. 3

a Low-power view, the tumor arose from the deep layer of the lamina propria mucosa (black line) and slightly invaded the submucosal layer (black arrow), the tumor surface was covered with normal foveolar epithelium (100×). b Tumor cells consisted of irregular anastomosing cords and cribriform glands that are similar to the fundic glands with invasion into the submucosal layer (arrow) (100×). c The complex glandular architecture seen at higher magnification producing anastomosing and so-called “endless glands” pattern, the tumor cells were mild atypia (200×). d Intestinal metaplasia had been seen in the background, in which we can see goblet cells (red arrow) and Pan’s cells (black arrow) (case 5) (200×)