Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is moderately enlarged but accentuated by the low lung volumes . There is mild pulmonary vascular congestion with ill - defined patchy opacities in the lung bases , possibly atelectasis but infection or aspiration can not be excluded . There may be trace bilateral pleural effusions . No pneumothorax is demonstrated . Left subclavian vascular stent is in unchanged position .
    OUTPUT:
    
Low lung volumes with mild pulmonary vascular congestion , possible bilateral trace pleural effusions , and bibasilar airspace opacities , possibly reflecting atelectasis but infection or aspiration can not be excluded .