Alternative Names: Spinal CT; CT - lumbosacral spine

How the test is performed:

The CT is performed with the patient lying face-up.

In some cases, an iodine-based contrast dye may be injected into a vein to help visualize tissues. In other cases, a CT of the lumbosacral spine may be performed after injecting contrast dye into the spinal canal during a lumbar puncture to further evaluate for nerve root compression.

The scan will usually last a few minutes.

How to prepare for the test:

The patient should remove all jewelry or other metals that may cause inaccurate images.

How the test will feel:

The x-rays are painless. The primary discomfort may be from the need to lie still on the table.

If intravenous contrast dye is given, the patient may initially feel a slight burning sensation within the injected arm, a metallic taste in the mouth, and a warm flushing of the body. These sensations are normal and usually reside within a few seconds.

Why the test is performed:

A CT scan is an excellent tool for evaluating fractures and degenerative changes of the spine (such as from arthritis). MRI is a superior exam for imaging the spinal cord and intervertebral discs.

Normal Values:

What abnormal results mean:

Conditions that may be revealed include:

• Cyst
• Tumor
• Pinched nerve
• Disc herniation
• Vertebral fracture
• Osteoarthritis
• Neoplastic disease (new abnormal tissue formation)
• Infection
• Metabolic disease

Additional conditions under which the test may be performed include osteomalacia

What the risks are:

• Iodine is the usual contrast dye. Some patients are allergic to iodine and may have a reaction, including hives, itching, nausea, breathing difficulty, or other symptoms.
• As with any x-ray examination, radiation is potentially harmful. Consult your health care provider about the risks if multiple CT scans are needed over a period of time.
• Pregnant or breast-feeding women should consult their health care provider about the risk to the fetus.

Special considerations: