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 normal with mild unfolding of the thoracic aorta . Hilar contours are unremarkable . Mild bibasilar atelectasis . Lungs are otherwise clear . No pleural effusion or pneumothorax . Internal external PTBD projects over the right upper quadrant .
    OUTPUT:
    
No acute cardiopulmonary abnormality .