Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lungs are clear bilaterally without focal consolidation , effusion , or pneumothorax . There is a retrocardiac opacity containing air likely representing a hiatal hernia , which was better assessed on the prior CT chest . The cardiomediastinal silhouette is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Hiatal hernia redemonstrated . No signs of pneumonia or other acute intrathoracic process .