Figure 4From: Analysis of 777 cases with obstruction of the ureter or extrahepatic bile duct by ultrasonography after normal saline retention enema Extrahepatic bile duct calculi. Seen under transabdominal ultrasound after normal saline retention enema, sand-like calculi (indicated by ST and the arrows) accumulated at the lower common bile duct (indicated by CBD) are visible behind the transverse colon (indicated by C).Back to article page