Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The cardiomediastinal and hilar contours are stable . A left upper lobe opacity adjacent to the left hilus is improving when compared to the prior examination consistent with improving aeration . Right lower lobe opacity persists and could represent atelectasis . A small right pleural effusion is present and minimally decreased in size . There is no appreciable pneumothorax .
    OUTPUT:
    
Opacities involving the left upper lobe and right lower lobe are stable to minimally improved in appearance from the prior examination . A small right pleural effusion is minimally decreased in size from the prior exam .