Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . Mildly increased opacity at the right lung base without a correlate on the lateral view is likely atelectasis but may represent earlier developing pneumonia in the appropriate clinical setting . There is no pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal . There is no free air under the diaphragm . No acute osseous abnormality is identified .
    OUTPUT:
    
Faint opacity at the right lung base may represent atelectasis or pneumonia in the appropriate clinical setting .