Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Back board hardware projects over the midline . Tracheostomy appears to be in standard position . Left PICC tip appears to have been advanced with tip now in the low SVC ; this could also reflect patient arm positioning . Left pleural effusion is unchanged . Bibasilar subsegmental atelectasis is seen . Subtle increased opacity in the right apex may represent a small amount of atelectasis . No pneumothorax is detected . Bilateral rib fractures are again noted .
    OUTPUT:
    
Subsegmental atelectasis and persistent left pleural effusion .