Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are unchanged compared to the prior study . The heart appears somewhat enlarged . A dual lead pacemaker is unchanged in position . Previous median sternotomy and coronary artery bypass graft noted . No pleural effusion , consolidation or pneumothorax seen . There is bony demineralization but no fracture seen .
    OUTPUT:
    
Mild to moderate cardiomegaly . No acute cardiopulmonary process seen .