Jaundice refers to a clinical sign of hyperbilirubinemia (>2.5mg/dl) which has many causes. In other words it is a clue to a diagnosis. It can be largely divided into 2 types
Imaging has a major role in detecting the obstructive causes.
Categories of causes
- pre-hepatic ie. hemolytic
- hepatic ie. within the liver
- post-hepatic ie. 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.