Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume and show mild interstitial opacities with a more confluent opacity in the left lower lobe . The cardiac silhouette is normal . The mediastinal silhouette is widened . The hilar contours and pleural surfaces are normal . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Mildly widened mediastinum is likely related to tortuous aorta that is accentuated by low lung volumes . Mild interstitial edema and left lower lobe atelectasis .