Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal view of the chest is performed . There is a significant amount of free intra-abdominal air . Secondary to this , lung volumes are low which has resulted in bibasilar atelectasis . There is no pleural effusion or pneumothorax . The mediastinal contour is unchanged , accounting for low lung volumes .
    OUTPUT:
    
Large amount of free intra-abdominal air . At the time of this dictation , the patient was in the OR for the above .