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Myelography (Myelogram)
To visualize the contour and diameter of the spinal canal (located inside the spinal canal and containing the spinal cord and nerves) a myelogram may be ordered by your physician. This test involves injecting a chemical substance referred to as 'contrast' or dye into the dural sac (the fine tissue that encases the spinal cord ane nerves) and obtaining either X-Rays or a Cat Scan to outline the dimensions of the canal and contour of the individual nerves.
A myelogram is particularly useful in evaluating spinal cord and nerve root compression (i.e. Spinal stenosis, spinal cord compression?. Myelography may also be particularly useful in evaluating spinal problems in the setting of previous spinal surgery where instrumentation was placed. In such cases MRI and other tests can be difficult to interpret due to the metal which has been placed in the spine.
