What is myelography?
Myelography, also called a myelogram, is an imaging test that checks for problems in your spinal canal. The spinal canal contains your spinal cord, nerve roots, and the subarachnoid space. The subarachnoid space is a fluid-filled space between the spinal cord and the membrane that covers it. During the test, contrast dye is injected into the spinal canal. Contrast dye is a substance that makes specific organs, blood vessels, and tissue show up more clearly on an x-ray.
Myelography involves using one of these two imaging procedures:
Fluoroscopy, a type of x-ray that shows internal tissues, structures, and organs moving in real time.
CT scan (computerized tomography), a procedure that combines a series of x-ray images taken from different angles around the body.
Other names: myelogram 
