Fig. 4From: Neuroendocrine carcinoma of the common bile duct associated with congenital bile duct dilatation: a case report Microscopic findings; neuroendocrine components and adenocarcinomatous components. a Neuroendocrine components occupy 90 % or more of the tumor invasive area, and a few adenocarcinoma components are observed (arrowhead) (H&E, ×100). b Early adenocarcinoma components spread on the mucosa of the tumor surface (H&E, ×40) Back to article page