Fig. 5

Pathological findings. The area surrounded by the square was coagulated and had a structure closely resembling the papilla of the duodenum (a Macroscopic image, b Weak magnification (arrow), hematoxylin and eosin (HE) staining, × 100, c High magnification, HE staining, × 400). A glandular structure similar to the bile duct was observed. The pathologist diagnosed the tissue at the bed of the gastric ulcer as a bile duct opening