MIBG (iodine-131-meta-iodobenzylguanidine) scintiscan
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 are asked to lie on a table which is placed under the arm of the scanner. The abdomen is scanned. You may be asked to return for repeated scans for 1 to 3 days. Each scan takes 1 to 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.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
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 pheochromocytoma, particularly when CT scan is negative or inconclusive, or if multiple tumors or a tumor that is not within the adrenal gland (extra-adrenal tumor) is suspected.
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