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Radiopaque agents are drugs used to help diagnose certain medical problems.
These agents contain iodine, which blocks x-rays. Depending on how the radiopaque agent is given, it localizes or builds up in certain areas of the body. When radiopaque agents are inside the body they will appear white on the x-ray film. This creates the needed distinction, or contrast, between one organ and other tissues. This will help the doctor see any special conditions that may exist in that organ or part of the body.