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Q. I have an injured disc and my doctor said I needed to have a discogram test. What is a discogram, and what will it show?
A. A discogram uses x-ray and a special dye injected into the center of the injured disc(s). The dye makes the disc clearly visible on x-ray film and a fluoroscope screen. The discogram can help your doctor diagnose which disc(s) are damaged and whether you will need surgery. The discogram is better than an x-ray or myelogram for determining whether there is a disc problem, because a plain x-ray shows only the vertebrae, and a myelogram only shows whether the disc has entered the spinal canal.