Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there has been interval removal of a right - sided subclavian central venous catheter . Tracheostomy tube remains in standard position . The cardiomediastinal and hilar contours are within normal limits . The lungs are well - expanded . There is no pleural effusion or pneumothorax . There is decreased opacity of the right lung base . Subtle left lung base opacity persists and could relate to aspiration .
    OUTPUT:
    
Subtle left basilar opacity could represent aspiration .