Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . A dual - lumen left - sided central venous catheter is again seen , limited to end at the right atrium and cavoatrial junction . Cardiomegaly persists with mild pulmonary edema somewhat improved . There may be a trace right pleural effusion . Relative increased opacity at the lung bases most likely relates to overlying soft tissues and atelectasis .
    OUTPUT:
    
1 . Small pleural effusion . Bibasilar atelectasis . Mild improvement in the mild pulmonary edema .