a-c. Microscopically, the antrum lesion showed a well-differentiated papillary adenocarcinoma limited within the gastric mucosa (HE stain. × 10) (a). The prepyloric lesion showed a mainly well-differentiated papillary adenocarcinoma partially invading the submucosa (HE stain. × 20) (b). The lesion extending into the duodenal bulb was limited within the duodenal mucosa and showed an identical histology to the prepyloric part (HE stain. × 10). The arrow shows the beginning of Brunner's glands (c).