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Abdominal ultrasonography (with Doppler) of dilated intrahepatic bile ducts, in this case because of pancreatic cancer. The bile ducts are colorless (black) in contrast to blood vessels (portal vein near center, and hepatic artery to the right of it) which have Doppler signal.
When the intrahepatic bile duct wall has protrusions, it is clearly seen as central dots or a linear streak. [10] Caroli disease is commonly diagnosed after this “central dot sign” is detected on a CT scan or ultrasound. [10] However, cholangiography is the best, and final, approach to show the enlarged bile ducts as a result of Caroli ...
The bile duct [1] [4] (formerly known as the common bile duct [4]) is a part of the biliary tract. [4] It is formed by the union of the common hepatic duct and cystic duct. It ends by uniting with the pancreatic duct to form the hepatopancreatic ampulla. It possesses its sphincter to enable the regulation of bile flow.
The biliary tree (see below) is the whole network of various sized ducts branching through the liver.. The path is as follows: bile canaliculi → canals of Hering → interlobular bile ducts → intrahepatic bile ducts → left and right hepatic ducts merge to form → common hepatic duct exits liver and joins → cystic duct (from gall bladder) forming → common bile duct → joins with ...
Occasionally, the cystic duct may first run along the right side of the common bile duct for some distance before joining it, or may pass posteriorly around to the common hepatic duct to unite with it from the left side. [4] Rarely, the common hepatic duct and gallbladder join directly (with the cystic duct being absent), [6] [4] leading to ...
In patients with deranged liver function tests, ultrasound may show increased liver size (hepatomegaly), increased reflectiveness (which might, for example, indicate cholestasis), gallbladder or bile duct diseases, or a tumor in the liver. Ultrasonography of liver tumors involves two stages: detection and characterization.
The name biliary tract is used to refer to all of the ducts, structures and organs involved in the production, storage and secretion of bile. [10] The tract is as follows: Bile canaliculi >> Canals of Hering >> intrahepatic bile ductule (in portal tracts / triads) >> interlobular bile ducts >> left and right hepatic ducts [4]
[12] [13] Ultrasonography always detects dilatation of the bile ducts, but more rarely the tumor itself. [14] Magnetic resonance cholangiopancreatography (MRCP) is a good non-invasive alternative to these other procedure. This technique demonstrates hepatic parenchyma and it's accurate for detecting nodular carcinomas and infiltrating lesions. [15]