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A ct myelogram is a procedure used to obtain images of the bones and the spaces between the bones in the spinal canal. These images are obtained through X-ray and use of a contrast dye. The spinal canal is composed of the spinal cord, spinal nerve roots and the subarachnoid space which is a fluid filled area. During a ct myelogram the dye is introduced into the subarachnoid space by inserting a needle into the spinal canal. Once the dye spreads through the space, the spinal cord and nerve roots are clearly visible. A radiologist takes images of the spinal canal before and after the dye is introduced. The procedure may be performed with or without a CT scan.
Why it is done
A ct myelogram is done in case of a ruptured or herniated spinal disc, inflammation of the membrane that covers the spinal cords and brain and infection or tumor which is affecting the nerve roots and spinal cord. It may also be ordered to examine the degree of spinal stenosis and to detect problems in blood flow to the spine. Individuals with numbness in the arms or legs may also be requested to undergo this procedure. This procedure may also be done when other tests such as CT scans and MRIs have not detected any cause of pain.
How to prepare
In order to prepare for a ct myelogram, the individual must remove any jewelry or clothes that may cause interference during the x-ray test.
How it is done
The ct myelogram technique or the ct myleogram protocol involves introduction of a contrast dye into the lumbar region of the spine. The individual is made to lie down on the side or stomach on an x-ray table. After application of a numbing medication on the back, a needle is inserted into the spinal canal by making a puncture in the area. X-ray pictures are taken in order to guide the insertion of the needle into the correct area. First a sample of the canal fluid is extracted and then the dye is introduced. X-ray images are taken again. The procedure may last for half an hour, after which the individual needs to lie down with the head elevated for at least eight hours.
The individual may experience slight nausea, vomiting or headache after the ct myelogram procedure. Some bleeding may also occur at the puncture site. In very rare cases, a seizure may occur if the contrast dye enters the brain. In some cases, inflammation may occur in the spinal cord. The ct myelogram CPT code would differ depending on various factors. The ct myelogram CPT code for that of the lumbar spine is 72132.
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