Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding and bibasilar atelectasis . Ill - defined airspace opacity in the right lower lung may represent a focal consolidation or atelectasis , depending upon the clinical setting . There is no pulmonary edema , pneumothorax , or pleural effusion . The cardiomediastinal silhouette , including moderate cardiomegaly , is unchanged . There is a small hiatal hernia .
    OUTPUT:
    
Ill - defined right lower lung airspace opacity may represent atelectasis or focal consolidation , depending upon the clinical setting .