Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . Right upper lobe scarring is seen , unchanged from prior exam . Nipple shadows are noted bilaterally . Bibasilar opacities are seen , which likely represent atelectasis or scarring but can not completely exclude infectious etiology . A left upper lung calcified granuloma is again noted . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Bibasilar opacities likely represent atelectasis or scarring but can not completely exclude infectious etiology .