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Alternative names Return to top
Radionuclide cisternogram; Intrathecal scan; Spinal cord scan; CSF flow scan; CisternogramDefinition Return to top
A RHISA scan is a nuclear scan test using small amounts of radioactive material (radioisotope) injected into the cerebrospinal fluid (CSF) to detect disorders of CSF circulation.How the test is performed Return to top
A RHISA scan is a type of nuclear scan. Small amounts of radioactive material are injected into the cerebrospinal fluid at the lower spine. The cerebrospinal fluid is allowed to circulate for a time. The scanner can detect the presence of radiation emitted by the materials, and images are taken to illustrate the flow of those radioactive materials through the cerebrospinal fluid circulation.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.
For infants and children:
The preparation you can provide for this test depends on your child's age and experience. For specific information regarding how you can prepare your child, see the following topics:
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.Why the test is performed Return to top
The test is performed to detect abnormalities of CSF circulation.Normal Values 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 RHISA scan indicates disorders of CSF circulation, including:What the risks are Return to top
There is some risk any time lumbar puncture is performed, particularly a risk of infection. Risks for RHISA scan are no greater than when lumbar puncture is performed for other reasons.Special considerations Return to top
This procedure requires multiple scans, and the entire test may take 48 to 72 hours. You must be able to lie still during the scan. Update Date: 10/17/2003 Updated by: Jeffrey Brown, M.D., Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |