Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low , causing exaggeration of the heart size and accentuation of the pulmonary vasculature . There is minimal bilateral lower lung atelectasis . The lungs are otherwise clear . The heart size remains top normal . The mediastinal contours are unchanged , including mild tortuosity of the descending thoracic aorta . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
No acute cardiac or pulmonary process .