Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged but stable . The mediastinal and hilar contours are unchanged . The pulmonary vascularity is within normal limits . Mild patchy opacities at lung bases likely reflect atelectasis . No definite focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal atelectasis at the lung bases .