Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears to be borderline enlarged . The mediastinal contours are unremarkable . There are low lung volumes which causes crowding of the bronchovascular structures , but no overt pulmonary edema is demonstrated . Elevation of right hemidiaphragm is age indeterminate . Atelectasis is demonstrated in both lung bases . No left - sided pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Elevation of the right hemidiaphragm is of unknown chronicity . Comparison with previous radiographs is recommended .