On axial post-contrast-enhanced images there is evidence of a large, well defined, irregular, moderately enhancing soft tissue lesion noted almost completely eroding and replacing the sternum. Few non-enhancing necrotic areas are noted within. Few small calcified foci are noted inside. The lesion extends superiorly from manubrium sternum to the xiphisternum. Bilateral costochondral cartilages are also involved. The lesion abuts left brachiocephalic vein, arch of the aorta, ascending aorta and right ventricle. However, intervening fat planes are preserved. The lesion anterior invades subcutaneous fat and reaches up to the skin. The lesion measures 14.02cm (superoinferior) x 8.38 cm (transverse) x 5.8cm (anteroposterior).