Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild opacity in the left lower lobe retrocardiac region may reflect atelectasis , however pneumonia is possible in correct clinical setting . Enlarged cardiac and bilateral pulmonary artery silhouette is similar to before . There is increased vascular congestion . Pleural scarring at the right lung apex is unchanged .
    OUTPUT:
    
1 . Mild opacity in the left lower lobe retrocardiac region may reflect atelectasis , however pneumonia is possible in correct clinical setting . 2 . Increased vascular congestion . 3 . Enlarged cardiac and pulmonary artery silhouette is similar to before .