Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval decrease in size of the large right pleural effusion since the prior exam with improved aeration of the right upper lung . The left lung remains clear . There is no pneumothorax . The heart and mediastinum are partially obscured by the large effusion , thereby limiting evaluation . The bones and soft tissues are unremarkable .
    OUTPUT:
    
Status post thoracentesis with decreased large right pleural effusion and no pneumothorax .