Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is mildly enlarged . No signs of congestion or edema . Mediastinal and hilar silhouettes are unchanged since ___ . Left lower lung streaky opacity has been present and unchanged since ___ , therefore likely a scar . No new focal consolidation , pleural effusion , or pneumothorax . Note is again made of the right humeral prosthesis .
    OUTPUT:
    
Mild cardiomegaly . Stable linear scarring in the left lower lung . No signs of pneumonia or edema .