ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Kidney stones. Coloured frontal intravenous urogram (IVU) X-ray of the abdominal region of a person with kidney stones in the left kidney. IVU images are produced by injecting the patient with an iodine-based radio-opaque contrast medium prior to X-ray. The contrast is removed from the bloodstream via the kidneys, and enters the urinary system, where it becomes visible on x-rays almost immediately after injection.
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