Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is in position . A right - sided PICC line terminates in the superior vena cava . There is a pigtail catheter projecting over the right hemithorax . There has been marked improvement in aeration of both lungs but with persistent opacification of the right lower lung suggesting residual atelectasis . Confluent retrocardiac opacification is not specific but is also most often seen with atelectasis . It is difficult to exclude pleural effusions .
    OUTPUT:
    
Marked improvement in aeration of both lungs .