Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . Linear retrocardiac opacity is consistent with atelectasis . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is top - normal in size , but there is no evidence of acute cardiac decompensation . There is a mild - to - moderate hiatal hernia .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Mild - to - moderate hiatal hernia .