Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is left basal atelectasis . There is vague lucency below the right hemidiaphragm , which could represent interposed bowel , though the possibility of free air is also of concern . The right lung is clear . Cardiomediastinal silhouette is normal . No pneumothorax . No pleural effusion . Bony structures are intact .
    OUTPUT:
    
Findings concerning for pneumoperitoneum for which CT is recommended to further assess .