Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube terminates 4 .1 cm above the carina . The lungs are underinflated , resulting in bronchovascular crowding . There is no pneumothorax , focal consolidation , or pleural effusion . Bibasilar linear opacities denote atelectasis . A left - sided ventriculo - peritoneal shunt is present .
    OUTPUT:
    
No acute intrathoracic process . Low lung volumes .