Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates subcutaneous and mediastinal emphysema , which is unchanged to minimally decreased compared to prior exam . There is no pneumothorax . Lung volumes are low and right base atelectasis may be slightly increased . Right lateral rib fractures are identified but better assessed on recent CT .
    OUTPUT:
    
1 . Largely unchanged subcutaneous and mediastinal emphysema . 2 . No pneumothorax . 3 . Possibly slightly increased right base atelectasis .