The U.S. Food and Drug Administration is investigating the potential damaging effects of repeated magnetic resonance imaging after researchers found that a heavy metal used to create contrast in the scans can sometimes stay in patients' brains long after the body is supposed to flush the substance out.
The FDA called Tuesday for physicians to limit the use of the heavy metal gadolinium to only circumstances where it's clinically necessary while it investigates whether the metal might be harmful. The administration cited recent studies showing that patients who go through fou...
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