Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly lower compared to the prior exam with mild dependent atelectasis . There is mild edema . The heart is moderately enlarged . Mild central pulmonary vascular congestion . No effusion or pneumothorax . No focal consolidation to suggest focal pneumonia . Patient is status post median sternotomy . Numerous surgical clips project over the mediastinum , unchanged . Clips projecting over the upper abdomen are also unchanged .
    OUTPUT:
    
1 . Mild edema and cardiomegaly . 2 . No pneumonia .