What are the main differences between MRCP and ERCP?

The most significant difference is that MRCP is a non-invasive diagnostic test, while ERCP is an invasive procedure that can be both diagnostic and therapeutic.

• MRCP: Simply takes pictures of the ducts from outside the body. It does not use radiation (like an X-ray) and has a very low risk of complications. It is a great first-line test to determine if a problem exists.
• ERCP: Involves inserting a scope into the body and injecting a dye directly into the ducts. This allows for both visualization with X-ray and immediate treatment, such as removing a gallstone or placing a stent. Because it is invasive, it carries a higher risk of complications.