A 58-Year-Old Man Presents With Anterior NSTEMI

Figure 1: A 58-Year-Old Man Presents With Anterior NSTEMI

Figure 2: A 58-Year-Old Man Presents With Anterior NSTEMI

A 58-year-old man presented with anterior NSTEMI. Echo showed a large pericardial effusion that was drained and found to be haemorrhagic. Angiography revealed ‘unobstructed’ coronary arteries while contrast enhanced CT showed some extravasation of contrast (Figure A). Cardiovascular magnetic resonance (CMR) was performed visualizing a structure adjacent to the anterior wall. First pass perfusion images of the mass are shown as well as tissue characterization with late enhancement (Figure C, Video 1).

What is the most likely diagnosis?

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