Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is top normal size and cardiomediastinal silhouette is stable . Sternotomy wires are again noted . Lungs are symmetrically expanded and clear . There is no pulmonary edema or pneumothorax . Minimal blunting of the posterior costophrenic angles on lateral projection may reflect small effusions versus chronic pleural thickening .
    OUTPUT:
    
No evidence of pneumonia .