Emergencies of the Biliary Tract
摘要
Gallbladder is seen as an anechoic structure with wall thickness of less than 3 mm on ultrasound imaging. The normal common bile duct caliber is up to 5 mm in young adults, and it progressively increases with age, at the rate of 1 mm for each decade above 40 years. The intrahepatic ducts should not be more than 2 mm in diameter (not more than 40% of the caliber of the accompanying portal vein branch).