Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of the cardiac silhouette which remains mildly enlarged . The mediastinal and hilar contours are grossly unremarkable . Crowding of bronchovascular structures is present without overt pulmonary edema . Patchy opacities in lung bases likely reflect atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is identified . Hypertrophic changes are seen within the thoracic spine .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .