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A) Cardiac magnetic resonance short-axis image (Fast Imaging Employing Steady-state Acquisition) shows a mass lesion (arrow) with intermediate to hyperintense signal in the right atrioventricular groove, compressing the right ventricular outflow tract and abutting the right ventricle posteriorly. B) Axial magnetic resonance image (postcontrast) shows homogenous enhancement of the mass (arrow) in the right atrioventricular groove.
