Bile duct cyst

Bile duct cyst

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Classification

According to the Todani system, there are five types of bile duct cysts.

Type 1: Choledochal Cyst

• Account for 80% to 90% of all bile duct cysts
• Characterized by fusiform dilation of the extrahepatic bile duct
• Theorized that choledochal cysts form as the result of reflux of pancreatic secretions into the bile duct via anomalous pancreaticobiliary junction.
• Cyst should be resected completely to prevent associated complications (i.e. ascending cholangitis and malignant transformation).

Type 2: Diverticulum

• Account for 3% of all bile duct cysts
• Represents a true diverticulum.
• Saccular outpouchings arising from the supraduodenal extrahepatic bile duct or the intrahepatic bile ducts.