Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Heart size and cardiomediastinal contours are normal . Mild interstitial abnormality is not accompanied by any ancillary findings of heart failure , but could be edema nevertheless . Lungs are clear of focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Mild interstitial edema .