Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased retrocardiac density suggesting moderate hiatal hernia , unchanged in appearance since ___ . There are no discrete opacities in the lungs , which are worrisome for pneumonia . There is no pleural abnormality . The tip of a left PICC line is approximately at mid SVC . No pneumothorax or pleural effusion . Top normal heart size , mediastinal and hilar contours are unchanged .
    OUTPUT:
    
No pneumonia . Moderate - sized hiatal hernia , stable since ___ .