Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiographs of the chest demonstrate normal heart size . There is stable appearance of widened mediastinum secondary to unfolded thoracic aorta . The lungs are hyperinflated but clear . No pleural effusion or pneumothorax . No displaced rib fracture identified . No evidence of pulmonary vascular congestion
    OUTPUT:
    
No acute intrathoracic process .