Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . Mediastinal contours unremarkable . There is mild pulmonary vascular congestion . Patchy opacities in lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Mild degenerative changes are present in the thoracic spine . No subdiaphragmatic free air is noted .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis and mild pulmonary vascular congestion . No subdiaphragmatic free air .