A myelogram is a diagnostic examination of the spine. A special, x-ray sensitive contrast dye is injected to illuminate the spine, allowing identification of problems of the spine, spinal cord and nerve roots. This procedure uses local anesthetic to numb the tissue down to the spinal column. The physician guides a needle down to the spinal column and pushes it through the thin, tough membrane that surrounds the nerve roots and spinal cord. Contrast dye is slowly injected. It mixes with the spinal fluid and flows through the spinal canal. The spine can now be studied with x-rays or CT scans, and areas that are pinched or damaged can be identified.
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