Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal , and hilar contours are within normal limits . There is no pulmonary vascular congestion . Worsening linear opacities are noted within both lung bases , compatible with worsening atelectasis . No focal consolidation , pleural effusion or pneumothorax is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Worsening bibasilar atelectasis .