Clinical study of extrahepatic biliary adenoma

Figure 1 Adenoma of the bile duct that mimic biliary stone disease on magnetic resonance cholangiopancreatography. A: Gallstones, the dilatation of intra- and extra-hepatic bile duct and filling defect at the end of common bile duct; B: Multiple filling defects of hilar bile duct with dilatation of intrahepatic bile duct. The arrow symbols point to the adenomas.

Figure 2 Adenoma of the bile duct that mimic cholangiocarcinoma on magnetic resonance cholangiopancreatography. A: A mass at the end of common bile duct with the dilatation of common bile duct; B: The mass within the left and common hepatic ducts. The arrow symbols point to adenomas.

Figure 3 Contrast-enhanced computed tomography scan of extrahepatic biliary adenoma. A-C: Contrast-enhanced computed tomography scan shows dilatation of the intrahepatic or extra-hepatic bile duct with a slightly enhancement of the mass in left hepatic duct (A), hilar bile duct (B) and distal common bile duct (C). The arrow symbols point to adenomas.

Figure 4 The macroscopic images of extrahepatic biliary adenoma. The resected specimen shows a tumor at the distal common bile duct (pancreaticoduodenectomy).

Figure 5 Histological examination of the resected specimen. Hematoxylin and eosin staining shows adenoma (× 200).