Definition of MIBG scintiscan:

An MIBG scintiscan is an imaging test that uses a radioactive substance (called a tracer) and a special scanner to find or confirm the presence of pheochromocytoma and neuroblastoma, which are tumors of specific types of nervous tissue.

See also: Nuclear scan

How the test is performed:

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

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.

Before or during the test, you may be given an iodine solution to prevent the thyroid from absorbing too much of the radioisotope.

How to prepare for the test:

You must sign an informed consent form. You will be asked to wear a hospital gown. However, 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 table may be cold or hard. You must lie still during the scan.

Why the test is performed:

This test is done to confirm pheochromocytoma or neuroblastoma.