Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is a small hazy opacity obscuring the left heart border which could reflect atelectasis or possibly a resolving pneumonia . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Small hazy opacity obscuring the left heart border which could reflect atelectasis or possibly a resolving pneumonia . No prior for comparison .