Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pulmonary hyperinflation is longstanding . There is slight blunting of the costophrenic angles , suggestive of trace pleural effusions . Linear opacities at the lung bases are longstanding either persistent subsegmental atelectasis or scarring . Hilar and mediastinal silhouettes are unremarkable . Heart is normal in size . The patient is status post median sternotomy . Multiple surgical clips project over cardiac and mediastinal silhouettes . No pneumothorax .
    OUTPUT:
    
Trace bilateral pleural effusions . No focal consolidation . COPD .