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    MIBG scintiscan

    Adrenal medullary imaging; Meta-iodobenzylguanidine scintiscan

    An MIBG scintiscan is a type ofimaging test. It uses a radioactive substance (called a tracer) and a special scanner to find or confirm the presence of pheochromocytoma and neuroblastoma. These are types of tumors that affect the nervous tissue.

    How the Test is Performed

    A radioisotope (MIBG, iodine-131-meta-iodobenzylguanidine) is injected into a vein. This compound attaches to specific tumor cells.

    You will have the scan later that day or the next day. For this part of the test,you lie on a table under the arm of the scanner. Your abdomen is scanned. You may need to return for repeated scans for 1 - 3 days. Each scan takes 1 - 2 hours.

    Before or during the test, you may be given an iodinemixture. This prevents your thyroid glandfrom absorbing too much of the radioisotope.

    How to Prepare for the Test

    You will need tosign an informed consent form. You will be asked to wear a hospital gown or loose fitting clothes. You will need to take remove jewelry or metal objects before each scan.

    How the Test Will Feel

    You will feel a sharp needleprick when the material is injected. The table may be cold or hard. You must lie still during the scan.

    Why the Test is Performed

    This test is done to help diagnose pheochromocytoma when an abdominal CT scan does not give a definite answser. It is also used to help diagnsoe neuroblastoma.

    Normal Results

    There are no signs of a tumor.

    What Abnormal Results Mean

    Most often, this test is used to locate pheochromocytoma.

    It may bealso beuseful to detect multiple tumors or tumors that are located outside the adrenal tissues.

    The test may also be done for other conditions such asmultiple endocrine neoplasia (MEN) II.

    Risks

    There is some exposure to radiation from the radioisotope.The radiation from this radioisotope is fairly high compared to most others, so you may need to take some extra stepsfor a few days after the test. Your health care provider will tell youwhat actions to take.

    Before or during the test, you may be given an iodine solution to help keep your thyroid gland from absorbing too much iodine.

    This test should NOT be done on pregnant women because of the danger to theunborn babyfrom radiation.

    References

    Aslam S, Sohaib A, Rockall A, Bomanji JB, Evanson J, Roznek RH. Imaging of the endocrine system. In: Adam A, Dixon AK, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 71.

    Segerman D, Miles KA. Radionuclide imaging: general principles. In: Adam A, Dixon AK, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 5th ed. New York, NY: Churchill Livingstone; 2008:chap 7.

    Young WF Jr. Adrenal medulla, catecholamines, and pheochromocytoma. In: Goldman L, Ausiello D, eds. Cecil Medicine. 2th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 235.

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    • MIBG injection

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      Tests for MIBG scintiscan

      Review Date: 11/9/2012

      Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.

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