Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Port -A - Cath tip is at the cavoatrial junction . Lung volumes are very low . Increased perihilar and bibasilar opacities likely relate to vascular crowding as a result of low volumes . There is no focal consolidation or pleural effusion . No pulmonary edema . No pneumothorax . An esophageal stent is noted .
    OUTPUT:
    
Increased opacification at the right base probably relates to atelectasis , but aspiration may have a similar appearance .