Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . There is persistent right infrahilar opacity which has been present on prior radiographs and may be artifactual or atelectasis . There is no new focal airspace opacity to suggest pneumonia . Heart size is top normal . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process .