Figure 2

Microscopic findings of the specimen of extrahepatic bile duct resected 9 years prior. We examined the extrahepatic bile duct specimen resected 9 years prior and confirmed that it was well-differentiated adenocarcinoma limited to the mucosal layer of the extrahepatic bile duct throughout the specimen; hematoxylin-eosin, original magnification ×4 in (A) and ×20 in (B). A magnified observation of the rectangle in (A) is shown in (B).