Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Midline sternotomy wires and mediastinal clips are again noted . The lungs are clear bilaterally , without focal consolidation , effusion , or pneumothorax . A subtle opacity projecting over the inferior left heart border is likely a fat pad . Heart and mediastinal contours are normal . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process . Subtle opacity obscuring the left inferior heart border is likely a fat pad .