Jaundice refers to a clinical sign of hyperbilirubinemia (>2.5 mg/dl) which has many causes. It is often a clue to a diagnosis. It can be largely divided into two types
Imaging has a major role in detecting the obstructive causes.
Categories of causes
- pre-hepatic (e.g. hemolytic)
- hepatic (within the liver)
- post-hepatic (due to obstruction in biliary system)
The biliary system can be divided into
- intrahepatic system comprising of the hepatic ducts and its branches
- extrahepatic system comprising of common hepatic duct (CHD), common bile duct (CBD) and gallbladder (GB).
Obstruction at any extrahepatic site will lead to proximal dilatation.