Common Bile Duct (CBD) & Intrahepatic Biliary System Evaluation
Common Bile Duct (CBD) & Intrahepatic Biliary System Evaluation
A-Normal CBD Diameter
Adults: ≤6 mm (The normal diameter of
the common bile duct (CBD) on an ultrasound is between 1.8 mm and 5.9 mm).
Elderly (over 60 years): Can be up to 7–8 mm
Post-cholecystectomy: Can be up to 10 mm (due to
compensatory dilation)
After meals: May decrease slightly
Dilatation (>7 mm) suggests biliary obstruction
(stone, tumor, or stricture).
Double Duct Sign: Dilated CBD & Pancreatic
Duct → Suggests obstructive pathology (e.g., Pancreatic tumor).
B-Biliary System Evaluation
·
Intrahepatic Bile Ducts: Normally not dilated; dilation suggests cholestasis,
obstruction.
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