Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low accentuating the cardiac silhouette and pulmonary vasculature . Heart size is probably mildly enlarged with tortuosity of the thoracic aortic arch . Hilar contours unremarkable . There is left greater than right lung base atelectasis . The upper lung fields are clear . There is no large pleural effusion or pneumothorax . NG tube tip terminates in the low esophagus .
    OUTPUT:
    
Low lung volumes . No pneumothorax .