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Fig. 2A —42-year-old woman with chronic thromboembolic disease. Axial image from non-ECG-gated CT scan of thorax, taken at level of right ventricular inflow chamber, depicts prominent papillary muscles (arrow) connected via fine chordae tendineae (arrowhead) to tricuspid valve leaflets. Note severe right ventricular dilatation resulting from chronic right ventricular heart failure.