Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is again visualized in good position . Other support devices remain stable . The cardiomediastinal and hilar contours are stable . There is perhaps the appearance of decreased opacification of the right base and worsening opacification at the left base ; however this is likely due to patient positioning .
    OUTPUT:
    
Unchanged chest radiograph .