HER2-positive adenocarcinoma arising from heterotopic pancreas tissue in the duodenum: A case report

Figure 4 Histological findings of resected duodenum. A: Heterotopic pancreas tissues are located in the submucosal layer and the laminar muscularis mucosa (HE staining, x 0.08). Adenocarcinoma cells are positioned in closely to the heterotopic pancreas tissue (× 0.08); B: On magnified image of the black square in Panel A, papillary like growth of the adenocarcinoma is present in vicinity of the heterotopic pancreas tissue (HE staining, × 10 and inset × 200); C: On magnified image of the white square in Panel A, submucosal heterotopic pancreas tissue is composed of acinar and duct structure (HE staining, × 10).