Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are essentially clear besides mild left basilar atelectasis versus scarring . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormality . Significant amount of free intraperitoneal air seen below the right hemidiaphragm , although the degree of intraperitoneal air does appear to have decreased since earlier today .
    OUTPUT:
    
Free intraperitoneal air which persists but appears to have decreased in degree when compared to exam from earlier the same day .