Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A trauma board limits evaluation of these radiographs . Lung volumes are low , causing exaggeration of the heart size and accentuation of the pulmonary vasculature . The lungs are clear . There is no definite pneumothorax . No pleural effusions are seen . The heart is normal in size . Mediastinal contours are normal . There is elevation of the right hemidiaphragm , of unknown chronicity . No definite free air is seen within the abdomen on the supine radiograph .
    OUTPUT:
    
1 . No acute cardiac or pulmonary findings . 2 . No definite pneumoperitoneum , although evaluation is limited by supine technique .