Figure 1b. Cardiac angiosarcoma. (a) Axial contrast-enhanced CT scan shows a low-attenuation, lobulated right atrial mass (arrow). (b) Axial T1-weighted MR image obtained with gadolinium shows nodular enhancement of the right atrial mass (arrow). (c) Coronal T1-weighted MR image obtained without gadolinium shows the mass (arrow) arising from the free wall of the right atrium. The mass is slightly hyperintense relative to myocardium. (d) Right coronary angiogram shows tumor blush (arrow).