Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device is noted with leads terminating in the right atrium and right ventricle . The heart size is mildly enlarged . The aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Rounded opacity projecting over the region of the right atrium measuring approximately 2 cm could potentially be within the lungs . Remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities are seen .
    OUTPUT:
    
2 cm nodular opacity projecting over the right atrium . Lateral view is recommended to better delineate the location of this finding . No acute cardiopulmonary abnormality otherwise demonstrated .