Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Linear opacities in both lung bases are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormality is identified .
    OUTPUT:
    
Subsegmental bibasilar atelectasis .