Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiographs obtained 15 days prior , no significant changes are appreciated . Multi focal scarring and atelectasis are unchanged . Moderate , loculated , right pleural effusion is minimally smaller . Chronic right middle lobe collapse , better evaluated on CT chest dated ___ , is unchanged . Posterior right rib fractures are unchanged . Heart size is normal without pulmonary vascular congestion or pulmonary edema .
    OUTPUT:
    
Minimally smaller , loculated , moderate right pleural effusion . Otherwise no significant changes .