Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is normal in size . The hilar and mediastinal contours are normal . A subtle opacity obscures the left cardiac border , could reflect an early infectious process . Lungs are otherwise clear . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Subtle opacity overlying the left cardiac border could reflect an early infectious process in the appropriate clinical setting . Short interval followup is advised to document resolution . Discussed in person with Dr . ___ by ___ on ___ at 05 :00 AM .