Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The findings remain unchanged from prior examination . The heart appears mild to moderately enlarged as previously seen . Cardiomediastinal contours are unchanged . The lungs are clear with no evidence of acute infiltrates . No pleural effusions or pneumothorax . Bony structures are intact .
    OUTPUT:
    
No significant changes compared to the prior study . No acute pulmonary abnormalities .