Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . Linear opacities in both lung bases likely reflect subsegmental atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . No pulmonary vascular congestion is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar linear opacities likely reflecting subsegmental atelectasis .