Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable supine view of the chest . Exam is limited due to positioning and overlying trauma board . Low lung volumes are seen . The lungs are grossly clear . Cardiac silhouette is likely accentuated due to positioning and poor inspiratory effort . No contour abnormalities identified . No displaced fracture seen .
    OUTPUT:
    
No definite acute cardiopulmonary process .