Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , I doubt significant interval change . Possible atelectasis in the right cardiophrenic region / right middle lobe is unchanged . The cardiomediastinal silhouette is within normal limits . No CHF , focal infiltrate or effusion is detected . Minimal biapical pleural scarring is again noted .
    OUTPUT:
    
No acute pulmonary process identified . No CHF .