In this procedure, the provider uses a biliary endoscope, or choledochoscope, a tubular instrument with a light source and camera, to visualize the biliary ducts and dilate, or widen, a narrowed portion of the duct to prevent a blockage and leaves a small tube, or stent, in place to keep the passage open. She inserts the choledochoscope through an existing tube in the abdominal wall, placed in association with another procedure.
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