Fig. 2.

Histopathological findings of a SNADET with the GP. a, b Histopathological pictures show low- to high-grade adenoma with a villous or papillary structure. c The tumor shows gastric foveolar-like differentiation at the surface area. d The tumor also shows gastric pyloric gland-like differentiation. e–h IHC for phenotypes shows positivity for MUC5AC (e) and MUC6 (f) and negativity for MUC2 (g) and CD10 (h), compatible with the gastric mucin phenotype. GP, gastric phenotype; IHC, immunohistochemistry; SNADET, superficial non-ampullary duodenal epithelial tumor.