Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are decreased compared to the prior exam , which causes crowding of the bronchovascular structures . Minimal pulmonary vascular congestion may be present , but no overt pulmonary edema is present . Moderate cardiomegaly persists . The mediastinal and hilar contours are unchanged with apparent widening of the superior mediastinum likely attributable to mediastinal lipomatosis . No pneumothorax or pleural effusion is detected . Assessment of the lung bases is limited due to low lung volumes , with minimal patchy opacities likely reflective of atelectasis . No focal consolidation is demonstrated . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .