Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart remains mild to moderately enlarged . The mediastinal contours are unremarkable . No overt pulmonary edema is present , though there may be mild pulmonary vascular congestion . Patchy opacities in lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Mild bibasilar atelectasis . Possible mild pulmonary vascular congestion .