Fig. 3 Cardiovascular magnetic resonance shows a large, well-defined extracardiac mass (arrow) in the right cardiophrenic space, with partial compression of the right atrium and bowing of the interatrial septum to the left. A) A T1-weighted image and B) a T2-weighted image show a large mass that is hyperintense to the myocardium, indicative of significant water content. C) After administration of gadolinium, there was no enhancement of the mass, which suggested its avascular nature.