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We aim to discuss the diagnostic use of ultra-small superparamagnetic iron oxide (USPIOs) including ferumoxytol in targeted cardiovascular magnetic resonance imaging (MRI). Ferumoxytol is the only USPIO clinically available in the U.S. and is a negatively charged USPIO that has potential use for tracking and characterization of macrophage-infiltrated cardiovascular structures. As an iron supplement that is approved for treatment of iron deficiency anemia, the iron core of ferumoxytol is incorporated into the body once it is phagocytose