Conventional osteosarcoma typically appears as an aggressive metaphyseal lesion with mixed lytic and sclerotic components, cortical destruction, an ill-defined zone of transition, mineralized osteoid matrix, and an associated soft-tissue mass. Aggressive periosteal reactions, including sunburst-type spiculation and a Codman triangle, may occur.

Dislodged leadless pacemaker within the left pulmonary arterial circulation. Frontal chest radiograph demonstrates the radiopaque leadless pacemaker projecting over the left hilar region, rather than its expected position within the right ventricle. Axial CT image confirms the leadless pacemaker within the left pulmonary arterial circulation.