Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Midline sternotomy wires are again seen . The lungs are clear . A subtle opacity obscuring the left heart border is likely a fat pad and is stable from prior . No effusion or pneumothorax . Overall , cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
No convincing signs of pneumonia . Presumed fat pad abutting the left heart border accounting for the stable opacity at this level .