Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . A vague right lower zone opacity appears less distinct , and likely reflects chronic change from prior infection . There are no new consolidations seen .
    OUTPUT:
    
No evidence for acute pneumonia . A previously seen vague right lower zone dense opacity is unchanged and most likely chronic .