Review of anatomy and venous drainage of extrahepatic biliary tract.

What is it about?

Brief review of normal anatomy of extrahepatic biliary tract and the vascular supply of the bile duct. The article describes various patterns of arterial supply of the biliary tract and the venous drainage by the epicholedochal and paracholedochal venous plexuses.

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Why is it important?

The venous drainage of the bile duct is important because the paracholedochal venous plexus acts as a collateral pathway in portomesenteric obstruction and dilate to form portal cavernoma.