A medical imaging technique that takes X-ray pictures of the common bile duct after injecting contrast dye to make it visible.
From choledoch + Greek '-graphy' (writing or recording). This term emerged as radiographic techniques developed in the early-to-mid 20th century.
Before CT and ultrasound, this was how doctors could see if the bile duct had stones or blockages—they'd inject dye that shows up on X-rays like a glowing map of the plumbing system.
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