Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle opacity obscuring the inferior most left heart border is new from prior exam , possibly a prominent fat pad . No convincing signs of pneumonia , CHF , effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Probable epicardial fat pad accounting for subtle opacity obscuring the left heart border inferiorly . No convincing signs of pneumonia .