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A myelogram is a study in which a spinal tap is performed within the lumbar spine, and radioopaque (shows up on x-ray) dye is placed within the spinal fluid.  X-rays and CT scans are then taken.  The dye provides an outline of the nerves, and any abnormality, such as a herniated disk or spinal stenosis, can be seen as an indentation or defect in the normal filling of dye.  In the myelogram on the left, the normal column of white dye is significantly narrowed by compression upon the nerves.



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