Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left hemidiaphragm is elevated with associated mild atelectasis in the left lung base , similar to prior exams . Otherwise , the lungs are well expanded and clear . The cardiomediastinal silhouette is stable from multiple prior exams . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process .