Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain persistently low with unchanged hazy bibasilar / perihilar opacities which could be representative of aspiration . The cardiomediastinal silhouette and hilar contours are unchanged . A tracheostomy tube remains in standard position . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Similar appearance of bibasilar / perihilar hazy opacities which may represent aspiration .