MIBG (iodine-131-meta-iodobenzylguanidine) scintiscan

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Thyroid enlargement - scintiscan

MIBG (iodine-131-meta-iodobenzylguanidine) scintiscan

Definition:

MIBG is a nuclear scan test that uses injected radioactive material (radioisotope) and a special scanner to locate or confirm the presence of pheochromocytoma and neuroblastoma, which are tumors of specific types of nervous tissue.

Alternative Names:

Adrenal medullary imaging

How the test is performed:

A radioisotope (MIBG, iodine-131-meta-iodobenzylguanidine) is injected into a vein. Later that day (or the next day) you lie on a table that is positioned under the arm of the scanner. The abdomen is scanned. You may be asked to return for repeated scans for 1 - 3 days. Each scan takes 1 - 2 hours.

After injection of the radioisotope, you are given Lugol's iodine solution to block uptake into the thyroid. Because the radiation from this radioisotope is fairly high compared to most other radioisotopes, some precautions may be necessary for a few days after the test. The nuclear medicine personnel will instruct about specific precautions, which may include flushing the toilet twice after each use (to dilute radioactive material excreted in the urine) or other precautions.

How to prepare for the test:

Lugol's iodine solution may be given before the test as well as after administration of the radioisotope.

You must sign an informed consent form.

A hospital gown is usually worn during the scan, although loose-fitting clothing may be allowed. Remove jewelry or metal objects before each scan.

How the test will feel:

There is a sharp needle prick when the material is injected. The radioisotope is not felt by the body, and the scan causes no sensation, but the table may be cold or hard. You must lie still during the scan.

Why the test is performed:

To confirm the presence of pheochromocytoma or neuroblastoma.

Review Date: 8/3/2005
Reviewed By: Jonathan Gross, M.D., Department of Radiology, Columbia University Medical Center, New York, NY. Review provided by VeriMed Healthcare Network.

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