Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe cardiomegaly is unchanged . The mediastinal and hilar contours are similar . There is mild pulmonary vascular engorgement , also unchanged . Bibasilar airspace opacities could reflect atelectasis though infection or aspiration can not be excluded . No large pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Mild pulmonary vascular engorgement and bibasilar opacities possibly reflecting atelectasis but infection or aspiration can not be excluded .