Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of cardiac silhouette is noted . The lung volumes are low . The mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures but no pulmonary edema is seen . Streaky bibasilar airspace opacities likely reflect atelectasis in the setting of low lung volumes . Infection however is not excluded . There is no pleural effusion or pneumothorax . Remote left - sided rib fractures are present .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis , but infection is not completely excluded .