Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show a bilateral lower lobe opacity which likely represents atelectasis . The cardiomediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . Note is made of pneumomediastinum .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Pneumomediastinum . These findings were communicated to ___ , M .D . via telephone at 2 :48 p .m . on ___ after discovery at 2 :46 p .m . when the surgeon confirmed that the patient had recently had surgery .