Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are similar . There is crowding of bronchovascular structures with probable mild pulmonary vascular congestion , but no overt pulmonary edema . Small left pleural effusion is demonstrated along with patchy opacities in the lung bases , possibly atelectasis . No pneumothorax is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and small left pleural effusion . Patchy opacities in lung bases may reflect areas of atelectasis , though infection can not be completely excluded in the correct clinical setting .