Myelography

By instilling contrast medium into the dural sac, myelo-graphy demonstrates the location and shape of the sub-arachnoid space of the vertebral canal. It indirectly demonstrates lesions that encroach upon this space either internally or externally. Its role in this regard, however, has largely been supplanted by the advent of CT and MR

imaging, for these other procedures provide images of the lesion itself, not just its effects on the subarachnoid space.

Some physicians believe myelography combined with CT to be the preferred method of investigating cervical radiculopathy, on the grounds that it provides better resolution of bony lesions than MR imaging.29, 30 Other authorities contend that the preferred investigation is MR imaging coupled with plain radiographs.31,32,33

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