CMR is useful in defining the extent and tissue characterization of cardiac masses, allowing for an accurate diagnosis in the majority of cases [2]. However, the wide spectrum of clinical presentations and tissue characteristics by CMR may result in clinical uncertainty regarding the rarer mass types. Specifically, for children with persistent fevers and cardiac masses, the differential diagnosis includes malignancy, infectious endocarditis, IMT, IPT, and Rosai-Dorfman disease [3]. Because a