Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are within normal limits . No pulmonary edema is present . Minimal patchy opacities in the lung bases are present . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is seen .
    OUTPUT:
    
Patchy opacities in lung bases , likely atelectasis . Please note that infection is not excluded in the correct clinical setting .