Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . Slight opacity in the right infrahilar region may reflect atelectasis or aspiration . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . The aortic arch is calcified .
    OUTPUT:
    
Minimall opacity in the right infrahilar region may reflect atelectasis or aspiration .