Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . Note , a crescentic lucency under the left hemidiaphragm is most likely air within a decompressed stomach .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Crescentic lucency on the left hemidiaphragm most likely represents air within a decompressed stomach . If there is any concern for possible pneumoperitoneum , dedicated abdominal radiographs or CT could be considered for further evaluation .