Figure 6From: Analysis of 777 cases with obstruction of the ureter or extrahepatic bile duct by ultrasonography after normal saline retention enema Extrahepatic bile duct cancer. Tumors (indicated by T and the arrows) of the common bile duct (indicated by CBD) are visible behind the upper ascending colon (indicated by C). G stands for gallbladder, and PV stands for portal vein.Back to article page