Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . This accentuates the size of the cardiomediastinal silhouette . The heart size is likely mildly enlarged . The aorta is tortuous . There is crowding of the bronchovascular structures , but no overt pulmonary edema is present . No focal consolidation , pleural effusion or pneumothorax is present . There are streaky opacities in the lung bases likely reflective of atelectasis . Multilevel degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Probable mild cardiomegaly .