Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 2 views of the chest : The lungs are well expanded and clear . The cardiac silhouette is mildly enlarged . The mediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . Note is made of anterolisthesis at a level in the upper lumbar spine , partially imaged .
    OUTPUT:
    
No acute intrathoracic process .