Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two frontal images of the chest demonstrate well - expanded lungs , which are generally clear with some slight atelectatic changes at the lung bases . There is no pneumothorax or pleural effusion . Cardiomediastinal silhouette is unchanged . Again seen is a large hiatal hernia containing stomach elevating the lower lobe of the right lung .
    OUTPUT:
    
No acute pulmonary process seen . Unchanged chest radiograph .