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7. ERCP

An endoscopic retrograde cholangiopancreatography (ERCP) can give doctors a more precise image of the bile ducts. During this procedure, the physician inserts a thin, flexible tube into the mouth, through the esophagus and stomach, and into the small intestine to inject contrast dye into the bile and pancreatic ducts. The contrast is visible on x-ray, allowing for visualization of the ducts.

Endoscope ERCP Contrast Elena KHarchenko / Getty Images

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