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Radionuclide cisternogram

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Contents of this page:

Illustrations

Lumbar puncture
Lumbar puncture

Alternative Names    Return to top

Intrathecal scan; Spinal cord scan; CSF flow scan; Cisternogram

Definition    Return to top

A radionuclide cisternogram is a nuclear scan test used to diagnose spinal fluid circulation problems.

How the Test is Performed    Return to top

A lumbar puncture (spinal tap) is done first. Small amounts of radioactive material, called a radioisotope, are injected into the fluid in the lower spine.

You will be scanned 4 - 6 hours after receiving this injection. A special camera creates images that show how the radioactive materials travel with the cerebrospinal fluid through the spine and if the fluid leaks outside the spine.

You will be scanned again 24 hours after injection, and possibly at 48 and 72 hours after injection.

How to Prepare for the Test    Return to top

No preparation is usually necessary. However, if you are very anxious or agitated, sedation may be necessary. You must sign a consent form. You will wear a hospital gown to make the spine more accessible. Remove jewelry or metallic objects before the scan.

How the Test Will Feel    Return to top

During lumbar puncture, the lower back over the spine is numbed with an anesthetic. However, many people find lumbar puncture somewhat uncomfortable, usually because of the pressure on the spine during insertion of the needle.

The scan is painless, although the table may be cold or hard. No discomfort is produced by the radioisotope or the scanner.

Why the Test is Performed    Return to top

The test is performed to detect problems with spinal fluid circulation and spinal fluid leaks.

Normal Results    Return to top

A normal value indicates normal circulation of CSF through all parts of the brain and spinal cord.

What Abnormal Results Mean    Return to top

An abnormal study indicates disorders of CSF circulation, including:

Risks    Return to top

Risks associated with a lumbar puncture include pain at the injection site, bleeding, and infection. There is also a very rare chance of nerve damage.

The amount of radiation used during the nuclear scan is very small, and virtually all of the radiation is gone within a few days. There have been no documented cases of injury or damage caused by the radioisotope used with this scan. However, as with any radiation exposure, caution is advised if you are pregnant or breastfeeding.

In extremely rare cases, a person will develop an allergic reaction to the radioisotope used during the scan. This may include a serious anaphylactic reaction.

Considerations    Return to top

You should lie flat after the lumbar puncture (to help prevent headache from the lumbar puncture). No other special care is usually necessary.

References    Return to top

Spelle L, Boulin A, Tainturier C, Visot A, Graveleau P, Pierot L. Neuroimaging features of spontaneous intracranial hypotension.Neuroradiology. 2001 Aug;43(8):622-7.

Spieth ME, Kasner DL. Traumatic thoracic thecal sac laceration, leak, and pleural effusion diagnosed by radionuclide cisternogram. Clin Nucl Med. 2002 Nov;27(11):830-1.

Lund VJ, Savy L, Lloyd G, Howard D. Optimum imaging and diagnosis of cerebrospinal fluid rhinorrhoea. J Laryngol Otol. 2000 Dec;114(12):988-92.

Update Date: 7/17/2007

Updated by: Stuart Bentley-Hibbert, M.D., Ph.D., Department of Radiology, Weill Cornell Medical Center, New York, NY. Review provided by VeriMed Healthcare Network.

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