Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates top normal cardiac size , likely accentuated by AP technique and supine positioning . There is minimal unfolding of the thoracic aorta . The mediastinal and hilar contours are unremarkable . Despite slightly low lung volumes , the lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . No displaced osseous injury is evident .
    OUTPUT:
    
No acute cardiopulmonary process .