Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are essentially clear . There is mild blunting of the posterior costophrenic angles which may be due to atelectasis or small effusion . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality identified . Free intraperitoneal air seen below the diaphragm . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Possible small amount of atelectasis or trace effusions . Otherwise , no acute cardiopulmonary process . Free intraperitoneal air , not an unexpected finding given recent surgery .