Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . There is minimal patchy opacities in the lung bases likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild bibasilar atelectasis .