Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is not engorged . Linear and streaky bibasilar opacities are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormality is visualized .
    OUTPUT:
    
Subsegmental bibasilar atelectasis .