Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are relatively well expanded , with persistent linear atelectasis in the left lung base , unchanged from the prior study . There is no pleural effusion , pulmonary edema , pneumothorax , or focal consolidation concerning for pneumonia . The cardiomediastinal silhouette is stable . No subdiaphragmatic free air is noted .
    OUTPUT:
    
No acute cardiopulmonary process or subdiaphragmatic free air .