Figure 2

Horizontal long axis CMR images demonstrate a round, well defined posterior mediastinal mass with smooth extrinsic compression of left atrial wall which is hypo-intense on breath-hold Steady State Free Precession (SSFP) cine CMR (a, arrow), and shows homogenously high signal on T2-weighted dark blood turbo spin-echo image (b, arrow). T1-weighted inversion recovery gradient-echo myocardial perfusion imaging demonstrates heterogeneous, mostly peripheral, dynamic contrast filling of the mass suggesting vascularity (c, arrow), and T1-weighted, fat-saturated, inversion recovery late gadolinium enhancement image shows peripheral rim enhancement with no evidence of central enhancement suggestive of central tissue necrosis (d, arrow).