Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal contours are unremarkable . The hilar contours are normal without evidence of pulmonary vascular congestion . Linear opacities in both lung bases likely reflect subsegmental atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . A stent is noted within the trachea , though extension in to the main bronchi is not completely assessed . There are no acute osseous abnormalities .
    OUTPUT:
    
Subsegmental bibasilar atelectasis . Airway stent noted within the trachea though extension into the proximal mainstem bronchi is not well assessed , as would be expected for a Y stent . If there is continued concern for stent malpositioning , CT is a more sensitive exam .