Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show a left pectoral dual - chamber permanent pacemaker with two leads terminating in the right atrium and along the left ventricle . The course of the lead is unremarkable without evidence of pneumothorax . The patient is status post median sternotomy and mitral valve replacement with wires appearing intact . The cardiac silhouette is moderately enlarged but stable . The mediastinal and hilar contours are within normal limits and unchanged . The lungs show diffuse multifocal opacities predominantly in the left lung base and right perihilar region which are not significantly changed from ___ and may represent residual multifocal infection or scarring . A lucent area in the left mid lung raises the possibility of a pneumatocele . A small right pleural effusion is unchanged from ___ . No pulmonary vascular congestion or edema is present .
    OUTPUT:
    
1 . Left pectoral pacemaker with two leads terminating in the right atrium and along the left ventricle . No pneumothorax . 2 . Persistent diffuse multifocal residual pneumonia or scarring . 3 . Stable small right pleural effusion . 4 . Stable moderate cardiomegaly .