Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . Cardiomediastinal contours are unchanged . Reticular opacities seen at the periphery of both lungs likely represent chronic interstitial lung disease and are unchanged . Lung fields are otherwise clear with no evidence of focal consolidation to suggest acute pneumonia . No pleural effusions . No pneumothorax .
    OUTPUT:
    
No significant changes compared to the prior study . No radiographic evidence of acute pneumonia .