Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal supine view of the chest was obtained portably . The lungs are clear without focal consolidation , pleural effusion or large pneumothorax . The heart is mildly enlarged . The mediastinal silhouette and hilar contours are within normal limits allowing for patient position and portable technique . No displaced rib fracture is seen .
    OUTPUT:
    
No evidence of acute intrathoracic injury .