Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate symmetric well - expanded lungs . Mild enlargement of the cardiac silhouette is in part related to the AP technique . Cardiomediastinal silhouette is otherwise unchanged compared to the prior examination . Sternotomy wires are noted . There is mild interstitial prominence without focal consolidation . No pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .