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Lumbosacral spine CT

Definition

A lumbosacral spine CT is a computed topography of the lower spine and surrounding tissues.

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.

What abnormal results mean

Conditions that may be revealed include:

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.

Illustrations

CT scan
CT scan
Skeletal spine
Skeletal spine
Vertebra, lumbar (low back)
Vertebra, lumbar (low back)
Vertebra, thoracic (mid back)
Vertebra, thoracic (mid back)
Lumbar vertebrae
Lumbar vertebrae

Page Content:

Spinal CT; CT - lumbosacral spine