Introduction

• Ultrasound is the starting point for imaging the bile ducts and gallbladder.
   
• ERCP and PTHC allow for direct imaging of the biliary ducts. MRCP is a non-invasive alternative for imaging the biliary system.
   
• If involvement beyound the biliary system is suspected, CT may be performed.
   
• A more thorough discussion of these techniques may be found under the pancreatic procedures page.