(a, b) Contrast-enhanced CT showed a large retrocardiac left lung mass adjacent to the left ventricular pericardium, raising suspicion of cardiac invasion. T₁ weighted (c) and T₂ weighed with fat saturation (d) short-axis CMR images showing separation of the mass from the myocardium with a thin pericardial fatty layer. Complete resection of the mass was achieved. CMR, cardiac magnetic resonance.