Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip terminates approximately 3 .9 cm from the carina . Lung volumes are low . Heart size is mildly enlarged but accentuated as result of low lung volumes . Mediastinal widening is likely due to supine AP technique and low lung volumes . Crowding of bronchovascular structures is present without overt pulmonary edema . Streaky and linear opacities in the lung bases likely reflect areas of atelectasis . More focal patchy opacity in the retrocardiac region could reflect atelectasis but infection or aspiration can not be completely excluded . No large pleural effusion or pneumothorax is detected on this supine exam . No acute osseous abnormality is visualized .
    OUTPUT:
    
1 . Endotracheal tube in standard position . 2 . Low lung volumes with bibasilar atelectasis . More focal retrocardiac opacity could reflect atelectasis but infection or aspiration can not be completely excluded .