Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . The pulmonary vasculature is normal . Streaky opacities in the lung bases are slightly worse in the interval , and likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Bibasilar patchy opacities likely atelectasis .