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Chest CT, axial view, nongated image obtained after intravenous iodine contrast administration, demonstrating a large interventricular septal mass with low attenuation (red circle; mean attenuation 19.07 ± 39.34 Hounsfield units), consistent with avascular fluid content. The mean attenuation values for the IVS (blue circle; 111.72 Hounsfield units) and the left ventricle (green circle; 378.44 Hounsfield units) are also shown.
