Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is unchanged in position . A left PICC terminates at the lower SVC . Multiple intact sternal wires are again demonstrated . Extensive widespread pulmonary opacities have improved since ___ . No new opacity is detected . Tiny pleural effusions are stable . There is no pneumothorax .
    OUTPUT:
    
Interval improvement of extensive bilateral pulmonary opacities . No new focal opacity detected .