Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding and bibasilar atelectasis . Indistinct airspace opacities in the right lung base are new from the prior study and may represent atelectasis or early consolidation , depending upon the clinical setting . There is no new pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is unchanged . There is a moderate to large hiatal hernia .
    OUTPUT:
    
1 . Indistinct airspace opacities in the right lung base may represent atelectasis related to low lung volumes or early consolidation . 2 . Moderate to large hiatal hernia .