Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Left mid to lower lung and right basilar atelectasis is seen . There is blunting of the right costophrenic angle suggesting a small pleural effusion . Right pleural effusion appears to have decreased since interval although this may in part relate to differences in patient positioning . A trace left pleural effusion is difficult to exclude although no large left pleural effusion is seen . No evidence of pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Old right - sided rib fractures are again noted .
    OUTPUT:
    
Small - moderate pleural effusion appears possibly slightly decreased in the size since the prior study , although this may relate to differences in patient positioning . Areas of bilateral atelectasis / scarring .