Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mild to moderately enlarged . Mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Patchy opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis . Otherwise , no acute cardiopulmonary abnormality .