Visualization of normal biliary ducts with ultrasound.

Portions of the normal biliary ducts, the main left and right hepatic ducts, common hepatic duct and the common bile duct can be regularly demonstrated with static ultrasound equipment. This was achieved in 94% of patients in this series, when a positive search was made for the ducts. The normal common duct measured between 2 mm and 5 mm in 126 patients in this series in whom it was visualized.