Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes cause bronchovascular crowding and bibasilar subsegmental atelectasis . Indistinct airspace opacities in the right lung base may represent atelectasis related to low lung volumes or early focal consolidation . There is no pleural effusion , pulmonary edema , pneumothorax , or displaced rib fracture . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . No displaced rib fracture . 2 . Indistinct airspace opacity in the right lung base may be related to atelectasis from low lung volumes or early consolidation , depending upon the clinical setting .