Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small amount of free air under the right diaphragm is due to recent abdominal surgery . There is mild vessel cephalization without pulmonary edema . This is unchanged . Left lower lung atelectasis band is stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . There is mild cephalization of pulmonary vessels without pulmonary edema . 2 . Free air under the diaphragm is presumed to be from recent surgery .