Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . The aorta is mildly unfolded . The previously noted widening of the superior mediastinal contour has essentially resolved , likely due to low lung volumes . Pulmonary vasculature is normal . Hilar contours are normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Slight unfolding of thoracic aorta without superior mediastinal widening .