Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is unchanged . The aorta is tortuous . Mild pulmonary vascular congestion is present . Patchy opacities in the lung bases may reflect atelectasis , but infection is not excluded in the correct clinical setting . No large pleural effusion or pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Mild pulmonary vascular congestion . Bibasilar patchy airspace opacities , likely atelectasis though infection is not excluded in the correct clinical setting .