Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low oxygen accentuating the heart size as well as result in crowding of the bronchopulmonary vasculature . Heart size is normal with unchanged post-surgical mediastinal contour . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .