Heterotopic gastric mucosa in the duodenum.
D004381:Duodenal Ulcer / Q000150:complications* / Q000473:pathology / Q000601:surgery; D004386:Duodenum / Q000473:pathology*; D005743:Gastrectomy; D005753:Gastric Mucosa / Q000002:abnormalities*; D006652:Histological Techniques; D006801:Humans