Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear airspace opacities in the right lower lung are suggestive of subsegmental atelectasis . Ill - defined retrocardiac opacification may represent atelectasis in the setting of an elevated left hemidiaphragm or developing consolidation . There is no pulmonary edema common pneumothorax , or pleural effusion . The cardiomediastinal silhouette is normal . The descending aorta is tortuous . Hyperinflation suggests COPD .
    OUTPUT:
    
Bibasilar airspace opacities may represent atelectasis in the setting of low lung volumes or developing consolidation , depending upon the clinical setting .