Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subcutaneous emphysema overlying the right lung makes it difficult to assess for subtle pneumothorax . The possibility of a small right apical pneumothorax can not be excluded , particularly in light of a thin linear density along the superolateral right chest wall . There are also known bullous changes at the right lung apex . There is only mild patchy opacity at the right lung base , consistent with atelectasis . This includes changes in the right cardiophrenic region , which are slightly more pronounced than on the prior study . Equivocal minimal blunting of the right costophrenic angle . Right pigtail catheter remains in place . The cardiomediastinal silhouette is grossly unchanged . Left lung remains grossly clear , without CHF or focal infiltrate . Minimal subsegmental atelectasis or scarring at the left lung base . No gross effusion . Bullous change in the right paratracheal region . No obvious pneumothorax on the left .
    OUTPUT:
    
Allowing for obscuration by overlying subcutaneous emphysema , a small right apical pneumothorax is suspected . This could be slightly larger than on the prior study . This is , however , is difficult to confidently assess due to overlying subcutaneous emphysema and right apical bullous change . Otherwise , the overall appearance is quite similar . Patchy atelectasis and / or scarring at the right cardiophrenic angle is again seen , slightly more pronounced . Doubt CHF , frank consolidation , or gross effusion .