Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is essentially unchanged from prior . Lungs are well expanded and clear bilaterally with no masses , lesions , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is stable and within normal limits . The pleural surfaces are unremarkable . Incidentally noted is a hiatal hernia .
    OUTPUT:
    
No evidence of infection or malignancy . Hiatal hernia is noted .