Gastric heterotopia

(A) Medium power view of a biopsy specimen from the duodenal bulb shows foveolar epithelium (oval) and a central area of basophilic glands highly suggestive for gastric heterotopia (dashed oval).
(B) High power view of a biopsy specimen from the duodenal bulb demonstrates mainly chief cells and occasional parietal cells diagnostic of gastric heterotopia.