Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal radiograph of the chest was acquired . There is lucency of the upper lungs with splaying of the vasculature , consistent with emphysema . Streaky linear opacities within both lower lobes are not significantly changed in appearance compared to the prior study from ___ , thought to represent subsegmental atelectasis . There is no focal consolidation . The heart size is normal . The mediastinal contours are normal . No definite pleural effusions are seen . There is no pneumothorax .
    OUTPUT:
    
No acute cardiac or pulmonary process .