Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower than on the prior study . There is no focal consolidation , pleural effusion or pneumothorax . Intracardiac device leads end in the expected locations of the right atrium and right ventricle . The patient is status post median sternotomy . Mild cardiomegaly is unchanged . Mediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
No pneumonia , edema or effusion .