Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear with the exception of a small opacity overlying the heart in the lateral view likely from mild right middle lobe atelectasis . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No convincing evidence for pneumonia . Findings suggesting mild right middle lobe atelectasis .