Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been significant interval improvement in the layering right - sided pleural effusion which has now nearly completely resolved . There is residual a atelectasis in the right lung base , superimposed infection can not be excluded . A small left pleural effusion persists . The degree of atelectasis has improved slightly at the left base . A left - sided PICC terminates in the mid SVC . No pneumothorax seen . A tracheostomy is unchanged in appearance compared to the prior study .
    OUTPUT:
    
Interval improvement in the right - sided pleural effusion with an airspace opacity at the right lung base likely reflecting atelectasis , superimposed infection can not be excluded .