Fig. 5

Histopathological view of resected specimens. a View of the main tumor. Final pathological findings indicated L, less, type 0–IIc + IIb, 15 × 15 mm, tub1 > tub2, pT1a (M), med, INFb, Ly0, V0, pPM0, pDM0, pN0 (the Japanese Gastric Cancer Classification, 15th edition). b View of the tumor lesion around the pyloric ring. Final pathological findings indicated L, less, type 0–IIa, 10 × 10 mm, tub1 > muc > tub2, pT1b (SM), int, INFb, Ly0, V0, pPM0, pDM0, pN0 (the Japanese Gastric Cancer Classification, 15th edition). c Immunostaining showing CK19 expression in the muscular layer of the ectopic bile duct. No malignancy was observed in the resected ectopic bile duct