Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The heart is mildly enlarged . A retrocardiac density is noted compatible with known hiatal hernia . No focal consolidation , effusion , or pneumothorax . Mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm . Clips are noted in the right upper quadrant compatible with prior cholecystectomy .
    OUTPUT:
    
Mild cardiomegaly . Hiatal hernia . No signs of pneumonia .