Ultrasonography of the biliary tract
Author:
Mikael Häggström [notes 1]
Ultrasonography of the biliary tract encompasses the gallbladder as well as the intra- and extrahepatic bile ducts.
Basic screening
The biliary tract is sometimes best evaluated in the intercostal space (between the ribs), and sometimes in the upper right abdominal quadrant during inspiration (possibly with the patient turned to the right for gallbladder visualization), so both should be attempted.
- Scan the entire gallbladder in both its axial and transverse plane, looking mainly for gallstones (see Ultrasonography of gallstones) and wall thickening (see Ultrasonography of thickened gallbladder wall).
Borderline of a dilated perihilar bile duct (see Ultrasonography of gallstones for detailed ranges).
- Measure the width of the bile ducts, which is usually easiest for the perihilar bile duct (which is the region where the common hepatic duct becomes the common bile duct, at the hilum of the liver). A normal width of the perihilar bile duct can be reported as for the extrahepatic bile ducts, since it also excludes a more distal common bile duct obstruction.
- Also take a look at intrahepatic bile ducts to rule out obvious dilation.
Dilated intrahepatic bile ducts.[1]
It is usually preferable to also perform a general upper abdominal screening.
Report
Example in a normal case:
Gallbladder with thin wall and no gallstones. Normal width of the intra-and extrahepatic bile ducts.
- See also: General notes on reporting
Diseases
Notes
- ↑ For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.
