Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 1 day prior , no significant changes are appreciated . No pneumothorax . No new focal parenchymal opacities . Heart size is normal . No pulmonary vascular congestion or pulmonary edema . Small right pleural effusion is probably unchanged . Old right rib fractures are again identified . Inferior most median sternotomy wire has a small , unchanged fracture with leftward displacement of the sternotomy wire immediately superior .
    OUTPUT:
    
Small right pleural effusion is unchanged .