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intrahepatic ducts

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14 - Biliary Ultrasound
from PART II - ULTRASOUND
- By William Scruggs, Laleh Gharahbaghian
Edited by J. Christian Fox, University of California, Irvine
Book:

Clinical Emergency Radiology

Published online:

07 December 2009

Print publication:

29 September 2008, pp 218-235
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Summary

Biliary ultrasound is part of any complete abdominal ultrasound and limited right upper quadrant ultrasound. It is more difficult to perform abdominal ultrasound on obese patients. This statement is particularly true with regard to the liver, gallbladder, and associated structures. The limitations of ultrasound in the right upper quadrant are few. Since ultrasound creates 2D images of 3D structures, the experience level of the sonologist is very important. It should be noted that ultrasound is not the most accurate imaging study for cholecystitis. The biliary system is made up of the gallbladder, along with the intra- and extrahepatic biliary ducts. The intrahepatic ducts form in the subsegments of the liver and course toward the porta hepatis where they form the common hepatic duct (CHD). The intrahepatic ducts are more difficult to evaluate because they are normally very narrow.